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Good idea to create a test library, copy it somewhere in case it gets broken.
But, it may not be be simple - what you need is something you can run from the command line that will find the tag-word within a calibre library's ebook files, extract the text that follows the tag-word i.e. the original title, and write that along with book identifying data to a CSV file. You could then use the CSV to update the metadata via the Import List plugin.
You may need to convert the books to TXT and use a command line script to do it. Which OS do you use - Windows, MacOS or Linux?
BR
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