Are there any commentaries from Trinitarians that explain why the Holy Spirit doesn't have a throne/receive worship in Revelation? For being a co-equal member of the Godhead, it would appear that the Holy Spirit is, for all intents and purposes, absent from the major points, events, and these visions held in Revelation. 

For example, let's look at Revelation 5


  5 Then one of the elders said to me, “Do not weep! Behold, the Lion of the tribe of Judah, the root of David, has triumphed to open the scroll and its seven seals.” 
  
  6 Then I saw a Lamb who appeared to have been slain, standing in the center of the throne, encircled by the four living creatures and the elders. The lamb had seven horns and seven eyes, which represent the sevenfold Spirit of God sent out into all the earth. 7 And He came and took the scroll from the right hand of the One seated on the throne. 
  
  8 When He had taken the scroll, the four living creatures and the twenty-four elders fell down before the Lamb. Each one had a harp, and they held the golden bowls full of incense, which are the prayers of the saints. 9And they sang a new song:
  
  “Worthy are You to take the scroll and open its seals,
  because You were slain,
  and by Your blood You purchased for God
  those from every tribe and tongue and people and nation. 
  
  10 You have made them into a kingdom,
  priests to serve our God,
  and they will reign on the earth.” 


The Lamb Exalted


  11 Then I looked, and I heard the voices of many angels and living creatures and elders encircling the throne, and their number was myriads of myriads and thousands of thousands. 12 In a loud voice they said:
  
  “Worthy is the Lamb who was slain,
  to receive power and riches and wisdom and strength
  and honor and glory and blessing!” 
  
  13 And I heard every creature in heaven, and on earth, and under the earth, and in the sea, and all that is in them, saying:
  
  “To Him who sits on the throne,
  and to the Lamb,
  be praise and honor and glory and power
  forever and ever.” 
  
  14 And the four living creatures said, “Amen,” and the elders fell down and worshiped. 


Also see Revelation 7:9-12


  After this I looked and saw a multitude too large to count, from every nation and tribe and people and tongue, standing before the throne and before the Lamb. They were clothed in white robes, with palm branches in their hands. 10 And they cried out in a loud voice:
  
  “Salvation to our God,
  who sits on the throne,
  and to the Lamb!” 
  
  11 And all the angels stood around the throne and around the elders and the four living creatures. And they fell facedown before the throne and worshiped God, 12 saying, “Amen! Blessing and glory and wisdom and thanks and honor and power and strength to our God forever and ever! Amen.” 


Among others, those passages show the exaltation, worship, praise, honor, etc. all given to God and the Lamb. Not one mention of the Spirit having a throne, receiving dominion, etc. How can this be reconciled? Are there any Trinitarian commentaries available that seek to explain or offer up some sort of logical resolution as to why the Spirit, being co-equal and co-eternal, doesn't seem to be receiving the same reverence?
The visions in Revelation that you cited in support of your contention (“that the Holy Spirit is, for all intents and purposes, absent from the major points, events, and these visions held in Revelation…”)  seemed to ignore a critically relevant point in Revelation 5:6 about “the seven spirits of God” which are “the seven eyes of the Lamb", who is “the Lion of the tribe of Judah” – the glorified Jesus Christ at the centre of this one throne of God in heaven. This means that the Holy Spirit IS included in that particular scene of worship. Verse 6 is commented on by the Protestant and Trinitarian web-site below which details one possible interpretation of the phrase, ‘the seven spirits of God’:


  “The first is that the seven spirits of God are symbolic of the Holy
  Spirit. The Bible, and especially the book of Revelation, uses the
  number 7 to refer to perfection and completion. If that is the meaning
  of the “seven” in the "seven spirits," then it is not referring to
  seven different spirits of God, but rather the perfect and complete
  Holy Spirit.” https://www.gotquestions.org/seven-spirits-God.html


This would mean, then, that when the Lamb is receiving the worship of those surrounding the throne of God in heaven, the Holy Spirit is also being worshipped, as the seven eyes of the Lamb are part of his Being. There is no need for a separate throne for the Holy Spirit as he is 'within' the Lamb, Jesus, looking out from his eyes, as it were.


  Verses 13 to 14 state, “And every creature which is in heaven, and on
  the earth, and under the earth, and such as are in the sea, and all
  that are in them, heard I saying, ‘Blessing and honour and glory and
  power be unto him that sitteth upon the throne, and unto the Lamb for
  ever and ever’. And the four beasts said, ‘Amen.’ And the twenty-four
  elders fell down and worshipped him that liveth for ever and ever.”


Not only is the Father being worshipped, but also the Son (the Lamb) whose seven eyes are the seven-fold Spirit of God. There is the triune Godhead being worshipped on this one heavenly throne.

Further to the matter of the Bible supporting the idea of worshipping the Holy Spirit equally as is the Father and the Son, here is another quote from the same Trinitarian web-site:


  “The question of whether we should worship the Holy Spirit is answered
  simply by determining whether the Spirit is God. If the Holy Spirit is
  God, then He can and should be worshiped. Scripture presents the Holy
  Spirit as not merely a “force” but as a Person. The Spirit is referred
  to in personal terms (John 15:26; 16:7–8, 13–14). He speaks (1 Timothy
  4:1), He loves (Romans 15:30), He chooses (Acts 13:2), He teaches
  (John 14:26), and He guides (Acts 16:7). He can be lied to (Acts
  5:3–4) and grieved (Ephesians 4:30). The Holy Spirit possesses the
  nature of deity—He shares the attributes of God. He is eternal
  (Hebrews 9:14). He is omnipresent (Psalm 139:7–10) and omniscient (1
  Corinthians 2:10–11). He was involved in the creation of the world
  (Genesis 1:2). The Holy Spirit enjoys intimate association with both
  the Father and the Son (Matthew 28:19; John 14:16 …Since the Holy
  Spirit is God, and God is “worthy of praise” (Psalm 18:3), then the
  Spirit is worthy of worship. Jesus, the Son of God, received worship
  (Matthew 28:9), so it stands to reason that the Spirit of God would
  also receive worship. Philippians 3:3 tells us that believers “worship
  by the Spirit of God and glory in Christ Jesus.” There is one God who
  eternally exists in three Persons. When we worship God, we naturally
  worship all three members of the Godhead.”
  https://www.gotquestions.org/worship-Holy-Spirit.html


I submit these two quotes in support of Protestant, Trinitarian belief in the Holy Spirit being worshipped in Heaven, particularly as depicted in the book of Revelation. The one throne in heaven is the 'seat' of the Father, the Son and the Holy Spirit.  It is worth noting, also, that Catholic views on the worship of the Holy Spirit would not clash with Protestant ones.