The modification of tags will happen manually. I hope this can be done without the book directories.
I'm not sure my friend can keep up with DB related suggestions and workflows, so I want to steer away from database related solutions. CSV sounds simpler to me. Also, I want to review the changes before applying them, so just importing (archive/unarchive) the database may not be the best solution in this case.
I thought something similar to your last suggestion (that's why I asked if extending the Import List plugin is an option at the linked thread). I installed the Import List plugin, exported a library using calibredb and started the import (around 6500 titles). But it is taking too much time, unfortunately (it has been running for an hour and the import has not yet finished, I suspect it gets stuck for some reason). On the other hand using the catalogue feature to export data sounds very good (instead of directly using calibredb). That sounds simpler and more user friendly and will be easier to use for my friend. I'll keep working on this and try to find out why Import List is taking so long... Thanks a lot for your suggestions. If it wasn't for your replies I couldn't have come this close.
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