It might be worth talking to an Insurance company asking them to set up an over 55 farang medical insurance plan, the volume (if you could get it) could lift their costs and make it look viable to them. One issue would be the number of older Frangs that come here WITH medical issues because care is cheaper - this would keep them out of the insurance desired catchment group, this would lower the volume and perhaps frighten off the insurance company.

My wife is in the UK at the moment working (and doing exams), she has been offered a job as an insurance broker which she may (or may not) accept. This is because she is fluent in English (and obviously Thai too) and this could open up a new market for them with regard to Farangs. So, insurance companies are also looking, but its hard to find Thais good enough with English (and cheap enough to hire) that can translate such comples things. Granted that this may not include 55+, but its a start and she would be someone then able to investigate or suggest to her boss. This is all assuming she takes the job of course - and it would be post Christmas probably.