“But I don’t think anyone is going to change their nusach based on anyone’s arguments either way.”
This is exactly right. And, I’m glad you brought that up about the 12 nusachs. It’s taught that each corresponded to one of the 12 permutations of HaShem’s name (4!/2!) so that Klal Yisroal collectively covered every possible way of praying to Hashem.
Do you have an example of the case where the combining in Nusach Sphard causes absurd phrasing? I’m just curious.