It changes daily. As of now I believe Chiang Mai requires a negative swab test if you're entering from a red zone. If you're leaving right after ASQ though you'll have one.
If you're already in Thailand you absolutely can transition to a Non-O without leaving. ONLY the Non-OA (which is a different visa, 1 year multiple entry) has to be obtained from outside of Thailand. Also, the Non-O does not have a health insurance requirement.
So flying from Phuket to somewhere else in Thailand, transiting through BKK?
Domestic flights stay in the same terminal, you don't need to do security or immigration. 5-20 minute walk depending on where the planes are and if you need to be bussed from the airplane (which I doubt since the airport is dead).
Lol, very much doubt there's fiber up there. I didn't have rocket speeds, but had pretty stable 30ish mbps speeds if I remember correctly. Yeah, Maehongson province is pretty large, its like a 6 hour drive from one side to the other. Dogs in the town were really friendly, ran into a bunch of them. There is burning up there, I remember riding up a huge mountain where they have microwave antennas and breaking through the smoke layer at the top. Can't say how bad it is though, not really something that bothers me personally.
I've never lived in Maehongson, but I've been there a couple times. Without a doubt my favorite place in all of Thailand. In the winter time (nov-feb) it gets decently cold, like single digits/ teens.
I found the community up there extremely friendly and welcoming. Even the police would wave and say hello. There are condos, not sure about pet friendly though, I can ask my friend is she knows any places. One thing to note is that it is fairly isolated. The closest big C is about 2 hours away in Pai, so western stuff is a bit tough to get. Really nice 7-11 in town though, couple foriegners live up there and have a burger/pub.
Hey Jake, I'm actually planning on doing the Marhongson loop myself. I have a friend in Marhongson town who works for the local government (Don't know exactly what she does though), and she said everyone has to quarantine when entering Maehongson from chiang mai.
However, I also asked in a Chiang Mai group and multiple people said they've done the loop in the last week and had 0 problems. There are a couple checkpoints that take your temperature and look at your passport, but that's it. I sent them to her and she said that sounds about right.