Sounds like you have looked quite deeply into the question. I don't have strong feelings one way or the other about its usefulness, but then I add books to my library very slowly and don't use much of the metadata downloading tools.
There seems to be a fair amount in common between what you are proposing and kiwidude's LibraryThing plugin. Both require finding obscure internal IDs, both require scraping, and both require storing some additional information about the book. Perhaps he will come along and enlighten us.
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