Never try the mod that allow you to edit origin characters, to see how changing thing like face interact with custom expressions on characters in cutscenes and all that but i think the awnser is probably in that way
I mean: it's difficult to justified that changing origin character haircut is more lore breaker than make for example, gale a barbarian, and you can do it from day one
I hope they implement at least limited customization for origin, like haircut and hair, skin, eyes color