Chuck, in the UK the facts are:
a) proportionally there aren't that many taildraggers (same as US I suppose).
b) of those very few have Public Transport C of A's
c) there isn't that much demand for taildragger training since there aren't that many for hire.
So although there are probably quite a few suitably qualified instructors who would like to teach on taildraggers (myself included), they can't/don't as there isn't the opportunity.