Just wanted to post the conclusion to this story in case it helps anybody in a similar situation down the road. I finally got my clutch replaced at a local shop. Real Steel Diesel Truck and Trailer in Missoula, MT. They're a 2 man operation that will work on anything. When I came to pick up the bus, they were finishing up some maintenance on a brand new 1.2 million dollar Earthroamer SX. They honestly seemed a little more excited to work on my filthy, worn-out old clutch.
The old clutch was worn down until the rivets holding the wear material in place were doing most of the work. The clutch brake was missing a pad on one side, and the throw out bearing was totally shot. I feel really good about replacing all that.
Total cost was $4600. $1325 clutch (found locally - online can be found cheaper), $45 clutch brake, $25 pilot bearing. 15 hours labor at $150/hr. About $300 to get the flywheel turned (more expensive because it's an older basket style). A couple hundred bucks more for two new u-joints on the drive line and shop supplies.
I'm not excited about that bill, but it's $1400 less than the estimate from the only other place that returned my calls. Also, only I am really happy with the service from these guys.