Wire cup + knee. I had a similar experience with a chainsaw years ago. Got *very* lucky. But yeah, character-building, right?
I take it you've decided to go 1-piece on the prop shaft, then? Does this mean the risk of damage and reduced clearance aren't enough to overcome the benefits from simplicity and (I suspect) cost savings? If you're going to have the driveshaft custom-made, why not ask the professionals what they would recommend? If you'd like a second opinion, there's a thread up in the In-Progress Adventures section with a couple guys up in Canada did a lot of BBQing in BC. They ended up getting a custom axle built on the road and seemed very pleased with the service. Shop name is in the thread. Couldn't hurt to call, right?
EDIT: Here's the page in that thread where they mention the axle shop. Worth a shot.