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I'm not sure exactly what your question is?? An ePub is made up of HTML files (plus any css stylesheets, image files, font files, etc.) so there shouldn't be any "conversion" required.
I would just use Sigil and "Add existing files" and select the files you want to include.
Sigil should take care of all the nitnoid details except making sure that you are using proper xhtml rules (closing all your tags, etc.).
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