Haven't been able to get hold of the local guy with all the used Beemer parts, but I did find an online dealership that has the exhaust valve ($110), pushrod ($30), and the correct centerstand ($143) in stock, but doesn't have the tach cable.
If I can get hold of the local guy and he has the parts, I can have the bike running again this weekend. If not, I'll order the new parts and hopefully still have her ready to throw in the trailer for my upcoming trip to Road America.
Simply amazing that there would still be parts available at dealerships for a 32 year old motorcycle! Gotta love it!
On the centerstand, I don't know if I mentioned previously that it's got a chrome one on it right now. I don't know BMW's well enough to have known that it wasn't correct, but the sticker on it from the (not BMW) manufacturer was a pretty neat clue.
As pristine and complete and original as this bike is, a chromed centerstand just ain't gonna cut it, even if it's superior to the OEM unit. I'm sure the BMW one is more than good enough.