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Calibre will do that ON THE FLY. EPUB->AZW3 is almost instant, so no need to pre-convert unless you want to edit the AZW3 BEFORE sending.
Just set the device driver with the formats in order. See image
Note Kindles do NOT have EPUB ticked. so it will auto convert to AZW3 (first on list).
Try it. It does work
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