thanks. In the meantime, I had a look at the list of options and Penang is (relatively) close to Samui. So I guess Phnom Penh, Ho Chi Minh and Penang would probably be good candidates.
I find that hard to believe when they advertise it as income tax free. Besides, how does that work in practice, finding out you're working? Nomads do stuff on the computer, what are they going to do, go around asking people with laptops in cafes to prove that their internet browsing isn't work?