All right! I actually found one other person that could use this info!!!
As for the software - I did it myself in Excel. :) (I was an actuary for a short time in my ancient history.)
I looked at the commercial BJ analysis programs, but it wasn't clear that I could modify them to incorporate the Spanish 21 deck probabilities and rule mods.
So, I read a couple of papers online on how to do infinite-deck regular BJ calculations. (Over the years, there have been a few math/statistics majors here and there choosing this for their senior thesis.) I then set up a