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Also, I inquired about those foam filler things and got a host of negative responses. Apparently, they ruin the tire that you've sprayed them inside, and tire shops don't want to work on them as they have a habit of going boom when you're trying to dismount the tire from the rim.

So? It's your donut spare. You're not going to use it except to limp home or to the service station. Toss some of that fix-a-flat in there and it'll be as good as it needs to be for a donut spare. Just make sure to drive it immediately afterwards. It squirts some sticky compound in there that, if it's not rotating, will all just settle to the bottom and put the tire off-balance and possibly not fix the leak.
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Bitt Faulk