Well since we both live in the same climate, I'll share with you what you might want to consider. I removed my aux water pump because in the desert there really isn't that much need for heat. So I put a ball valve in its place to shut off coolant to the heater core. I was considering this a while back but I did another mod to cool my car instead.....but why don't you relocate your aux water pump somewhere that it could keep a faster, continuous flow of water? That way you would not need to alter the belt/pulley set up. The place I considered moving it was between the heater core and engine block hose to move water more quickly through the engine so cooler water could circulate more frequently. I never did the set up for this though, it only floated around in my head before I did my other set up:
http://www.peachparts.com/shopforum/tech-help/319665-i-need-forums-input-manual-engine-cooling.html