"self-insure" is a polite term for "you pay everything yourself by whatever means you can scare up."
Its been said 1000 times or more but Malaysian policies dont cover what one expects from a western policy. And, following a claim, that area of coverage would be excluded later. Get the flu in 2018 which you report on your annual report forms, in 2019 the entire respiratory system will be excluded from coverage. And, in the initial application in which you list all prior ailments in your life, all of those areas of coverage are excluded. You literally start off a new policy with very little coverage if you have been honest about your medical history. All of this happened to me. So I didnt take any policy and I self-insure.
In policies that work internationally, since you mentioned Singapore, yes as you said they are extremely expensive and still dont cover everything.
I'm not against you in any way, but what you are asking for doesnt exist in the world. There is no such thing as a cheap policy that covers everything and works in various countries. I realize that it SEEMS such a product should exist but it doesnt.
For American expats or anyone else having a similar insurance system, if you are on Social Security, you take Medicare and a Supplement policy. Then while in Malaysia you cash-pay for small problems and fly home for big problems. That would be the dirt-cheapest way around the problem. If you are caught in Malaysia with a stroke or heart attack and cannot travel, you are in big trouble if you dont have the savings account to pay the bills from.
Having said that, there was an expat in this group who recently said they paid about USD700 a month for a good-coverage international policy. Please google international health insurance and start applying in order to find out the costs.
Health and health insurance is the sore point, bane and the weak link of an expats life. Over the years I've many times proposed that expats INDEED start an insurance company but nobody has ever expressed any interest.
In years past I asked Blue Cross in US to create expat policies under which coverage would ONLY apply out of the country and I never heard from them. But last year someone in US said there was foreign insurance available. I didnt follow it up, maybe thats a good possibility for people now? All the companies in an expats home country would have to be polled now and see if there is anything today for expats.