Look up medical tourism. It's a thing already. The value-add would be vetting the medical practitioners. You go to your doctor because you trust them to do the right job. You go to a doctor in a foreign country, and it feels much more dodgy. Medical tourism groups may already do this; I haven't investigated it.

I toyed with the idea when I needed a couple of crowns. A friend of mine in Estonia and I worked out that two crowns is the break-even point for traveling to Estonia and seeing his dentist.