Found how to convince Amazon to accept (in certain situations) pure KF8 format.
Take any ePub book uploaded to our forum, convert it to mobi with kindlegen, extract azw3 using KindleUnpack, rename azw3 to mobi, send via Send to Kindle, you're done.
Same succeeded with ePubs from Project Gutenberg.
Interesting that ePubs converted by Calibre most often get rejection.
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