Personally, I will open the toc.ncx, nav.xhtml or the embedded HTML TOC in an external editor and then copy/paste into the header tag. Batch edit the existing headings to something like <h3 class="h3class" title=""> as an example and then copy/paste from the external editor in the "". Also useful when some genius decided that images are the way to go for chapter numbering. I played with doing this programmatically but the results generally took as much or more effort to clean up than simply doing it manually from the start. So damn many special cases needed to be accounted for.
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