An option I haven't seen mentioned yet -- use the "Tweak ePub" (shortcut "t") functionality to "explode" the epub and read/edit in your favorite WYSIWYG HTML editor. Once done, rebuild the epub and continue on your way.
Or you could do it by hand -- open any epub file in your favorite zip tool (or rename to .zip and open with Windows Explorer), extract, edit, rezip, and rename.
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