I admire your technical prowess, but I have to question the actual thing you're trying to do.
Books are written in either British or American English - they are distinct "variants" of the language. I just don't see the point of trying to "convert" an American English book to use British English spellings - it will still use American English grammatical constructs, and it will be obvious to the reader that it was written by an American author. What's the point?
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