Why not just write a Tinderbox export template that includes the
correct tagging?  Take a look at some of the included HTML and text
export templates, as well as the Tinderbox manual to get a grasp of how
export codes work.  Essentially, you can simply take the HTML export
template you're already using, and simply change <h2> to \section.

For example, I'm guessing you're using the name of the note itself for
the heading, so your current template says something like
<h2>^title^</h2>.  Change this to \section^title^ and you should be
able to get what you're after.  If you run into a snag contact me off
list and I'll see if I can give you a hand.
Doug
demiller[at]gmail dot com