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For what its worth. The newer version of ExtractThumbs needed pillow installed which I don't think is possible on Kindle (at least not by me, compiling the library for kindle). Ended up using KindleUnpack which is prehaps a bit heavy for my use, but does the job.
Also, BooksByMail ended up crashing out on me with out of memory error, so I rewrote that functionality with imaplib instead, rather than offlineimap.
All in all, works seamlessly now. Email myself the azw3 books and launch the KUAL extension and they appear in my library with covers. Many thanks for the pointer in the right direction!
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