Lancelot - you wild puppy!
I actually rolled the dice for the last 3 months too - not by choice but FIREing abroad certainly have a lot of practical things to be done (and suddenly your company is not there to arrange all that); insurances, airplane ticket, address changes to home country, faxes to banks that do not accept changes by email, updating of various forms, visa-arrangements, address change to pension plan, arrange for internet/telephone Etc. in the new home Etc.
I have the brochures Etc. from the above providers - also from Sun Alliance having Ok (high for inpatient but low for out patient) coverage too at resonable prices.
Thaihealth is the best value I found (wealthy-healthy plan) if one is on a budget but would be wise to add some travel insurance when one is in USA or Europe. They sell those too (emergency/accident only) rather cheap.
While healthcare is good and cheap here it would be sad to see ones FI vaporate due to getting sick on a trip back home or a serious accident/illness here. Goodhealth estimates an evacuation from BKK to Singapore (considered the best healthcare in Asia if not the world) with brain surgery or similar and a month in hospital to cost $120k.