I have read time and time again that the reason a badger brush is superior to a hog bristle one, is that "badger hair more closely resembles other very similar furs such as human hair, both in its softness and its ability to absorb water".
Armed with that knowledge, have you ever come across a shaving brush made with human hair? Sounds ideal to me -- and comes in so many varieties: blonde, black, auburn, redhead.....