I didn't read through the whole thread, but has anyone thought of buying a cheap set of plastic hubcaps like these ($27 delivered):
Universal 14" Chrome ABS Plastic Hubcaps KT998-14 : eBay Motors (item 310199966330 end time Mar-12-10 09:34:01 PST)
...and screwing/bolting the pizza pans to the hubcaps. That way you could remove them easily. At $27 + ~$13 for 4 pans, you're still looking at less than half the cost of the hubcapmike.com ones.