I just discovered that this problem was discused in Problem installing on Linksys EA7500v2 as recently as September 2, 2022. It seems that the end result was failure.
So I'm probably wasting my time trying to do this. After all it's been said that trying the same thing repeatedly and expecting a different result is one definition of insanity.
Still, If anyone has an idea about how to make this work, I'm all ears