Make another hero or 2 for Jeanne D’Arc, and then Name the faction Army of Orlean or whatever. The issue as I see it, is that it’s breaking from the precedent that has been set by framing it around a character, instead of a historical group. So just have 1 or 2 other leaders from the time period/region, and the player chooses which one they want to play with, and each would be similar but with slight differences/specialties.
Probably too late now though. Oh well.