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I've considered doing something similar myself. I would do it as a two-step process, and it won't be quick.
1) Glance through the books to make sure the current tags are actually relevant to the books.
2) Right click on "Tags" in the tag browser panel, select "manage tags" - from there you can edit each tag name directly. It's a more efficient interface, in my opinion, for managing the actual words used as tags.
If you change a tag so that it matches an existing tag, calibre automatically merges them to avoid duplicates, in case that was a concern.
I can't think of any automated way to do it, but hopefully others will have more ideas for you.
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