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Of course there isn't such a plugin--that's why I ask for help towards making one.
As I make those changes to every single book, I am slightly feed up with the manual procedure--thus the sigil plugin, which already works--and the wish for a calibre one, which I hoped would be simpler, besides avoiding fishing among 'calibre:user_...' tags and providing for changes between old/new conversions (I have spotted already two different ways in which my custom field gets into the .opf file).
My notion was rather to get the fields/tags values directly from calibre and fit them into the opf meta, deleting all the information I don't want in the epub--a kind of 'customized polishing', in fact.
Very grateful for any hints...
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