That worked great, thanks!
A follow-up question: any recommendations for how to get the outputs to be different entries than the originals? I was thinking I would just edit the metadata of the converted outputs in bulk by adding "Mirrored" to the end of each title and "-1" to each UUID (and then reimport the original books from back-ups after deleting the .original_epub files). But I cannot see a way to add a word to the title of multiple books in the bulk metadata edit, since it is only search/replace.
I guess I still could modify the UUID at least, replacing each "-" with "-0-" or something, but I welcome a way to add a simple word at the end of many titles at once if you might know of one.
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