Yep, Mobipocket Creator Professional. Download free from Mobipocket website. You do need to be careful that the html files stay in the right order when you drag them into the publication window (but they are numbered sequentially). Every once in a while I find a html gets inserted in the wrong order, but you can drag the file or click on the move down button. It will also build you a TOC.
It's still generally much faster than letting Calibre run for an hour.
cheers
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