But we spoke with the server, and she found me a dish from the prix fixe arrangement that I could eat, and spent the night just making sure there was always some of that dish on the table.
Everything went better than expected. Sure, I don't have to be worried about death from being exposed to food I won't eat, but I could've called ahead, and would've, if the stakes were that high.
I guess all that's to say: good restaurants are pretty accommodating, even when they aren't doing the normal menu thing. It's really not that crazy.