Scaevola, I will team up with you to get this done

. I'll see if I can make a submod like Don Diego did to make these Historical Legions available in custom battle. After that I'll go down the line like last time and make a list.
When I was doublechecking the cards last time, I had helmet, arms, shield, legs, and armor categories. Like LEGO blocks, I assigned Montefortino or Gallic; Long Sleeves, Short Sleeves; Long Pants, Short Pants, Tunic, etc.
These categories also receive colors. Once a spreadsheet is made, I suspect as you do that it would be a matter of recoloring and copy/pasting the different parts. Your priority could be the new art, and I could prioritize the cut and paste jobs
(while I'm at it, I might move the "eagle" and "prima" logos to the topleft, since they often get cut off in-game)