To get just the KF8 (AZW3) out of the Kindlegen combined file, load the file into Calibre and using the KindleUnpack plugin, you can split the file into both Mobi and AZW3 (KF8). Keep the AZW3 file and delete the rest.
Do not be surprised if the AZW3 is larger than the ePub as the compression is not as good.
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