i have a partial but tedious solution. unzip the epub examine the text in notepad++ & flip through the view/encode options until you find one that shows the actual problem character ( I think view as ANSI is the setting ). then open the epub in sigil & use sigil find replace. but this only works if you can successfully paste the problem character(s) into sigil's find box.
it worked e.g. for my composite character that looked like a semicolon as I was able to copy + paste an instance of this from the book view text into the find box & then type a real ; in the replace box.
i think also that viewing epub in ADE on PC will always give same result as viewing on reader, to you can test changes before transferring the book.
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