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You don't have to convert AZW3 to ePub. All you need to do is use KindleUnpack to decompile it and you'll be able to see any Calibre added stuff in the OPF.
That line about Calibre 1.47 was added by Calibre. When you open an AZW3 with Calibre's eBook Editor, it does add stuff to the OPF like it does on a metadata update for an ePub. The only way to get around that is to unpack the AZW3, make your edits, and put it back together with KindleGen. But then you do have to split out the Mobi gunk.
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