Indeed Flexible, if HKG is too expensive then with reference to finding medical services abroad, my HK doctor goes to Thailand for his personal medical needs. He is content with the professional service and finds the cost much less than HK.
And there are many more than Bumrungrad if you are looking there. Google is your friend but personal recommendations help too. I cannot help there.
Casual aside. Have you ever thought that Bumrungrad sounds like a Russian city with a public health problem?