There are certainly marital arts schools here, somyes there is demand. No idea if that means that hole is already filled though.
Unlike snifter i wear my duck down every day through winter. But I work outdoors and start early. If the sun is out it warms up quickly, but until then it can feel bloody cold. Frost does happen (just not often).
You are quite right about the wind. It does seem very windy often. But then there's lots of times it's not that windy.
The weather here is better than the U.K. In my eyes. Summer is often too hot (this year has been great though). The sea is beautiful temperature now.
Work wise, I'd imagine from what I've talked to other people in your field, that you'd have no problems there.
There aren't as many opportunities for kids here as in the uk, but that's because there are nowhere near the amount of people in Thai country.
My hayfever is a bit better here than it was in the uk.
Personally i cant imagine moving my whole life anywhere I hadn't visited before. Could you take some time out when you got here and visit both places?