Personnaly I would love this...but there is one major differance between GW games and Malifaux. GW is all stat heavy games. you have what...8 or 9 stats on the stat line, whereas Malifaux has what...5? so unless you are going to add in decreases and increases to Abilities, Triggers, Actions and Spells im not sure there would be that much of a impact on the game.
if it could be made to work...geat thing...however I have a feeling its a bit more complicated than it sounds