For People Who Have Played DAO : Keeping Wynne After Becoming A Reaver

I think u unlock reaver anyway, so just unlock it, and reload, then u'll still be able to be a reaver

 

Once u unlock the reaver profession, u can even start a new game and u'll have it.
So once u have it, just reload to a save where u still had her, if im not wrong u only need not to destroy the god ashes and she'll stay... u'll still be able to play reaver because u unlocked that class game-wide.
unless u really want to destroy them and in this case I don't know