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@Tanjamuse - Unlikely. Saved Metadata is a copy of the metadata before replace_metadata, include/exclude, etc. Reversing all that is prohibitively complex.
Your request did make me realize something else, though.
I've been working on implementing Title Page update as a separate feature, but it's not going to do what many users will expect.
Specifically, it occurred to me that the first thing a new user is likely to try with it is changing the Title in Calibre, doing 'Refresh Title Page' and then not understanding why their changed title doesn't appear in the title page.
I'm starting to feel the 'correct' answer, if you want to put Calibre metadata/columns into your ebooks, is to use Calibre's built-in metadata jacket.
Admittedly, I haven't explored the idea any further than, "yes, metadata jacket is customizable", but it offers some clear advantages--most prominently that can be used on ebooks from other sources and other formats(than epub).
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