Solved, with a caveat.
Deep in an embedded module, I found a path that hadn't been updated properly.
Here's the weird thing. When running under Calibre 5.5 in debug mode, the log simply showed the module as loading properly. I went to another machine and installed version 4.3 and when I installed there in debug mode, the error log didn't report the plug-in as installing, and showed me a nice, detailed report of where the problem was.
Has something changed in version 5?
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