We did adopt Sheba. I don't react allergically at all to her saliva, apparently, and only slightly to her dander (which might not be her: it could be something else from the shelter), so I think this should work. Won't be able to say it's definitely worked until some time has gone by, of course, but I think there's reason to be optimistic, based on how things have gone so far.
It was a very long ride back for her, and unfortunately she does get carsick -- though we'd been driving for just over an hour before she actually threw up, and she'd had a pretty intense day already and was perhaps not at her best to begin with. So hopefully this won't be as much of a problem in the future.
I'll add a picture or two to this post as soon as I get them uploaded and sorted and everything.
I'm pretty sure there are better photos possible; this was just the best of what I was able to get today. Perhaps there will be others to go with this week's Nina picture.
Except for the ears, she really does look an awful lot like a scaled-down Fervor.