Well, the nice people at PayPal made good on their purchase protection policies. The full amount less ~45¢ got refunded this afternoon. It may be a few days until the refund posts to my credit card, but I'll take the win.
It is unfortunate that it had to go down this way. Now because of this, Project Bike in the cyclocross/gravel (recreational) thread is going to get an additional cable housing stop and additional drill & tap in the bottom bracket for cable guides to allow for the possibility of a conventional non-Rohloff drive train. We'll see how this goes. I asked for the derailleur stop to be tucked away inboard under the S-bend chain stay to hide it from view. Not a contingency I'm eager to employ. But there it is. A permanent change and a bunch of work done on goodwill by the builder because Cycle Monkey is a quitter.