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I've done a test with an ePub and restructured it into an AZW3. I simply exploded the AZW3 and deleted all the files/folders, then pasted in everything from an exploded ePub, (except the META-INF folder). Finally I renamed content.opf to metadata.opf and rebuilt the AZW3.
Kindle Previewer was perfectly happy with the result, including the TOC. This is much faster than doing a conversion. The only odd thing is that the ePub is 203KB and the AZW3 is 319KB. Looks like I can therefore write a simple plugin to do this job.
One issue I have found with ePub to AZW3 is that Kindle Previewer complains that there is a "Missing Cover Image" and that this is "an integral part of the Kindle reading experience". This happens whether calibre does the conversion or I use my restructure method.
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