I was hoping NOT to go to KL. I have (so far) a single ticket for KL. That will get me past airline/immigration difficulties.
If the Office in Hua Hin will not issue an extension pre-Xmas, I can a) go to KL or b) go to the immigration office in Kantang before the 60 days are up.
So, I now have a flight to KL booked. Therefore Lufthansa and immigration at BKK will be happy. I'll try to get an extension at the immigration office in Hua Hin shortly after arrival... and wing it from there.
If needs be, we'll fly to KL and return shortly afterwards, well before we depart for the Trang islands.
I certainly don't want to be put up at the "Bangkok Hilton" at all...