from Chiang Mai it is probably easiest to visit the Thai embassy in Vientiane, to apply for a 60 days tourist visa single entry. The requirements are absolutely doable (contrary to absolutely shitty requirements in Penang, Hanoi or Ho Chi Minh), however you will need an appointment with the embassy, and they require 3-4 working days for the processing. Here is the relevant webpage of the Vientiane Embassy
correct! On spot! I don't understand why some advise him to visit immigration and apply for a 30 days (touristy) extension. It is completely out of reach for him to this date
What are you trying to tell us? He will not receive a 30 days "touristy" extension, because he never was or is on a tourist visa. He needs to get out of Dodge ASAP, exit Thailand by air, pay the overstay fine of 15 or 16 x 500.- THB, get the overstay stamp in his passport and the computer entry. That's ALL that's left for him to do. There is no way he gets a 30 days extension, as well as they won't issue an "application denied you have 7 days to leave the kingdom" stamp. . . . . .once he is outside of Thailand, he is free to start any visa application process over or whatever comes to his mind
in case you stay in a hotel, the hotel will automatically register you TM30 in the online system. Once you move into a private accommodation, the houseowner or landlord will have to report you by TM30 within 24 hours of you arriving at the residence - either personally on Immigration or by the online system
at the Immigration Ko Phangan they will definitely ask you if you have been registered in your accommodation by TM30. If not, the fine for late reporting can be up to 2000.- THB and your landlord and you will need to fulfill the registration ASAP, before your stay permit runs out
the process takes 3-4 "work days" (not over the weekends!!) . . . . . . . However, she MUST make an appointment first! How long will THAT take? She only got 8 days left. . .obviously NOT doable any more