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It's possible that the dual-format mobi may never be seen as anything other than a personal document, regardless of the EXTH records. I'm assuming since the split-out and modified azw3 file seems to work as you expect it to, that you've tried simply renaming the kindlegen output from .mobi to .azw3 or .prc (in addition to the header modifications) to see if that affects how the device classifies it?
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