Im motivated to make this post purely because im loving that a lot of the changes in the october update are inspired by suggestions on here.
I really dont think it would take much effort to add a good amount of new hairstyles, facial hair, etc. to the game. there really isnt a lot to chose from so the game definitely needs it.
But I also think that this should roll out with some way for existing players to characters to change their look as well. maybe a small barber station in ever settlement that allows you to change your look (and maybe even usernames?? 
)