I can net it out for you at least in Thailand where I was an English teacher for 5 years. If you are not from the USA, U.K., Ireland, Canada, Australia or New Zealand you are not 1st tier as a hire.
Taking the high road….your accent. There are 67 countries English is the native language. But only U.K., Ireland, Canada, USA, Australia, New Zealand need apply.
Looks easier than Issan as there you need numerous photographs of the family in front and outside of the houses. A map with directions from immigration to your house and 2 witnesses. This was the case in Khon Kaen. Regardless, marriage extensions are more difficult than retirement extensions by far.