Not sure this will help, but...?
Have you tried selecting all the books that have tags you want to change, and do a 'Edit Metadata - In Bulk'?
There you can remove all tags, remove certain tags, and put in the tag you want.
Or, You could do a 'Search and Replace' on the tag name.
Or, under Tags, go to the tags you don't want anymore and rename them to the tag you want to change them to. Then the program will sort them all together.
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