I think you guys are taking Nico's argument a little too serious. I'm guessing the biggest reason they won't be in the game is because they, like I said, were in just one battle as an undersized batallion. Their uniform was nothing special in the field anyway.
Not being able to properly wear a shako is just an extra reason to keep them out. The strap is supposed to go UNDER THE CHIN where it has ACTUAL USE keeping the shako in its place. Otherwise, it serves no purpose and should be removed or folded up, like the French do.