El Mahdi
Muad'Dib of the Anauroch
Forget the mechanics for a second and think about this logically. VoP says you can have no magic weapons. Kensai says that your body parts become magic weapons. Tell me that there isn't a conflict of interest here.
I don't know, I don't see a problem. Mechanically they end up working the same as anyone else, but fluff-wise very differently. Not a problem IMO.