how about when getting into a server, you choose the nation and you choose what type (ie: inf, [sub under inf]guards, cav [sub under cav] guard cav [sub under guard cav]hussars, lancers, heavy cav, dragoons, [sub under cav]hussars, lancers, heavy cav, dragoons, navy [if it's allowed with ship and land units like coastal seige, and if there's no land just navy] [sub under nay] sailors, marines, arty, lights/skirms), then you select the regiment that was part of that type in the nation; and for formality it would be arranged from the older regiment to the more recently made (1er at the top going down to 2e, 3e, 4e, and so on) until the last reg that participated in the war shows up at the very bottom. I expect them not to make every reg, which is why they would leave out some regiments that didnt fight at all or were just garrisoned at cities. If someone made a reg that was a "not-so-popular" reg maybe this is were mods come in and make that unit's uniform replacing a exiting reg like in NW with adding skins that replace the given reg shown in the game.