They're presumed to be hiding inside Thailand at the moment so their options are to continue hiding, attempt to escape the borders of Thailand or turn themselves in.
Anyway, I really doubt the Thais will sentence him to death or some crazy life term if they do catch him.
And these are libertarian seafaring bitcoiners. A sailboat, watermaker/collector and a fishing rod means they should be able to make it anywhere by water.
If I was one of these people I'd find the cheapest bus I could find and get into cambodia asap. I would also wear a very large hat and sunglasses. Then I'd go asap to the us-cambodia embassay.