Please understand, OP, even if you're only suggesting that it should put some kind of lesser restriction or subset on your options, in doing so you would still be saying, ultimately, that visual appearance absolutely IS an essential part of your charisma.... and that is the thing that I think most people here are disagreeing with. It's not essential to being charismatic; it can sure help, but it's not essential... and by making charisma have an impact on your visual options, no matter how minor, you'd be saying that it was.