Seems like a great mod to kill your engine to me.When I fit AAZ's to T3's (Vanagons) I make a point of putting them onto a V belt and getting rid of that serpentine belt to save the crank nose.Remember also that if you use the alternator that they run at a different speed and your tacho will read on the piss.
I don't think he was talking to you, zuk. Here's a pic of the pulley from tdiparts.com: