Up until this moment, I was not aware of Calibre's Tweak-epub feature. I just tried it and it looks very handy. I could have used that had I known about it. I think this comes from pretty much thinking of Sigil as the epub editing tool and Calibre as a utility for conversion, organizing, and ebook viewing. But yes, the tweak tool looks nice and a much faster way to go than the manual way I did it. Thanks for the suggestion!
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