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Baka no Kami- If the 'add a dummy text file idea works' then you could create a csv catalog for the books in question, massage it into a .bat file that adds a text file to each book. See ==>>
calibredb — add_format
You only need the id in the csv. Rename to .bat, prepend each line with "
calibredb --add_format " and append each line with "
anytextfile.txt" so you get something like :
Code:
calibredb --add_format 129 anytextfile.txt
calibredb --add_format 129 mytextfile.txt
Create
anytextfile.txt with notepad or something.
Exit calibre and run the bat file.
Later - remove the TXT formats
BR