You might wander down 1 forum to to the Sigil group.
Inside EPUB is (x)html and the other stuff you need.
Sigil .2 (now in Beta) looks as easy as a 150 clicks to get the files into a row
A couple of more hundred clicks if the files don't have H(1,2,3) tags already, that will be used for the TOC.
The results (EPUB) can be brought into Calibre
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