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I'm not sure of any easy means but I do hope you realized that #myshelves was just what *I* use and was just intended as an example.
What I would have suggested would have been to create a new column of the correct type, and then made use of bulk metadata editing to copy data from the old column to the new one, and then update the driver to point to the new shelf.
I assume lots of the books are in series; if so why not just highlight all books in a series, and then use bulk metadata editing to add the appropriate tag to all the books at the same time?
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