Note that if you're talking about old-fashioned mobis, there are no classes to rename. Because neither CSS nor class names are used in their internal markup. KindleUnpack will take those files and produce a single html-ish file you can work with. No need to convert them to htmlz. If you're talking about the newer KF8 files, then calibre edit or KindleUnpack will produce editable markup with the "original" markup and class names. You can still have the issue of multiple HTML files in that case, but I'd like to point out that both calibre's editor and Sigil both have a "Merge" feature (at least I think calibre's editor has that feature ... I know it can Split files) that allows you to combine HTML files without converting.
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