I would suggest a quick and dirty test to make sure that changing the KF8 EXTH data in the hybrid mobi/KF8 even has the desired effect on Kindle devices (when unsplit).
With regard to the PDOC/EBOK cdetype (EXTH 501), there would need to not only be a way to change the record but also to add the record entirely. Because so far as I can tell, Kindlegen/Previewer doesn't create the 501 EXTH record in the output it creates in the first place. That record doesn't get added until delivery from Amazon to a user's device.
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