I would have thought that it was easy enough to do this within a library by taking advantage of the Author Tweaks/Manage Authors facility and the plugboard facility (depending on what you are starting with).
This would accomplish all the required changes to author/author-sort and any required renaming of files/folders within the Calibre library file/folde structure. The metadata already embedded in ebook files would then be updated as soon as you tried to do a Send to Disk/Device for ones of interest.
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