Path of least resistance is to keep the AC with the stock belt and stock routing -- if you never energize the clutch, think of it as an idler. <img src="/forums/images/graemlins/pfft.gif" alt="" /> You could run it as onboard air, as well...

Pay attention to the direction everything drives... a couple of your possible setups will reverse the flow of your water pump, which may be a challenge. Dunno off the top of my head whether there are reverse rotation pumps available for this application.

Idler pulleys are easily available at the parts store or junkyard, in multiple diamters and widths, with or without ribs.

Randii