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As far as I can tell, the only thing that Sony stores for position of sideloaded books is the bookmark. Which is like an EPUB3 CFI, but not identical (nor is calibre's), but is easily (so much for maniacal laughter!) translated to the calibre format (they're closer to each other than to EPUB3). FWIW, EPUB3 counts nodes (text nodes + tags) while calibre/Sony seem to count only tags, with the significant difference that Sony's CFIs don't count the <HEAD> tag.
So, in any case, it's going to have to open the book to calculate the position.
Thanks for the answers. Now, off to try some more stuff!
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