After thinking about it the easiest option is for me is to probably to go with tri state column. As that will match calibre and calibre companion. And I will have a visual indicator that I need to change something.
Btw you are correct in not wanting to change how calibre used to work earlier as this would probably break stuff for other users. Maybe a tweak could work where you can set what you want the entry to be when a book is first added.That way the default for calibre wont change but people could have the option to change.
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