Sorry for not following up, my computer crashed the first time I tried to convert the thing. The second time it took 3 hours. In the end I just got a regular EPUB file, except every dictionary entry is its own html page inside the EPUB, that is, it's an EPUB with 10k subpages.
I wonder what's the PBI format that Pocketbook seems to use, Calibre doesn't give me an option to convert to it.
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