Move to SV, get a job with Google/FB/etc.
If you're single, you'll have a max-out-of-pocket of a few thousand dollars, but that will more than be made up for by the increase in salary. And you will have good insurance subsidized by your employer.
Such high earners can cover their healthcare in any country. It's the rest of the people you have to worry about. And if your illness endangers your employment status you definitely don't want to be in the US.
But if it’s something that is controlled with the the right care and they’re a pretty good engineer, then the risk of moving here is much smaller than they realize.
I'm not sure americans understand how annoying it is the process of getting an H1B (or any other visa to be honest)
You will have so much more leverage to negotiate for your skill set. They Truly value your skills.
Kick your safety net to the side, jump the pond and make a good business decision for yourself.