Can the 的 particle ever function without "nominalizing"? From my answer in What is the meaning of 的 in “有一天你会明白的”? and according to Charles N. Li, Sandra A. Thompson - Mandarin Chinese: A Functional Reference Grammar, I believed the function of the particle 的 from a grammar perspective is always that of the nominalization particle, i.e, it allows that a verb, a verb phrase, a sentence or a part of a sentence to function as a noun phrase.
In the other answers it was argued that when 的 occurs as a final particle, it denotes affirmation or intensifies the tone and that 的 does not actually nominalize anything. However, it seems to me this meaning might still be compatible with a nominalization function from a grammar perspective (even though it might not be completely straightforward to realize). The same situation occurs for example with the 是...的 construction, when its meaning is to emphasize details in the past but from a grammar point of view (according to the book I referenced) it is still a nominalization.
Question: From a grammar perspective, does the particle 的 function in this (or any other) situation without nominalizing?
In order to justify your reasonings, please provide some (technical) references.
You can find the answer in 百度百科 using the key word 语气词 in Baidu search.  Here is the quote relevant to your question:

普通话里最基本的语气词实际上只有六个：的、了、呢、吧、吗、啊。其他一些，有的用得较少，有的是因为语气词连用而产生连读合音的结果，例如“啦”是“了啊”的合音。这六个语气词根据在句子里出现的先后次序可以分为三组，

It has a table listed all the usages of those 语气词.  I can't copy the table from my mobile device. But it has this example 我不会忘记你们的。to illustrate the usage of the 语气词 的.
It's written in Chinese though.  You can try to understand it using a translation tool.