I wrote my own function so far to get the data from metadata.calibre, and it still is pretty fast (right now I can get a search result back within 30 seconds for a (manipulated) calibre file with 19000 datasets.)
Just have to think of something to get back data that go over a few lines, but that won't be a big problem either.
One question to that file, is the name metadata.calibre or .metadata.calibre? On my Kobos the file has the dot, on my Cybook not. Of course I can simply search for both and take the one I can find (if there is any, this solution for sure is only for Calibre user!), but I wonder what the naming conventions here are...
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