Is "和声细雨" ever an acceptable variant of "和声细语"? There is this ad, that looks a little something like this:



The full text says


  致忙碌的你
  在工作中总是对客户和声细雨
  却忘记了对父母说声
  谢 / 谢 / 你


和声细雨 seems totally wrong to me &amp; I'm guessing it should probably be 和声细语. 和声细语 can be found in《现代汉语规范词典》&amp;《多功能成语词典》- while 和声细雨 is not listed anywhere I know. It seems like quite a rookie mistake, though, for an advertisement agency to make. Is "和声细雨" ever an acceptable variant of "和声细语"?
The copy writer using "和声细雨" instead of  "和声细语" is an unforgivable mistake 

The correct idiom with 细雨 at the end is  微風細雨 

The correct idiom with 和風 at the beginning is '和風麗日' ( variant of  '風和日麗')

Many common idioms can be rephrase for artistic reason, but the characters in them cannot be changed

Example:

Standard: 風和日麗 (wind is gentle, sunshine is pleasant)-- variant: 和風麗日 (gentle wind, pleasant sunshine)

Standard: 窮山惡水 (hostile mountains, vicious water -- variant: 山窮水惡 (mountains is hostile; waters is vicious)

Standard: 鴻圖大志 (grand ambition, high goal)-- variant: 志大圖鴻 (goal is high, ambition is grand)