okay thanks everyone i decided to pay for extension rather than border bounce. Its definitely more expensive but keeps options open if i wanna go to thailand before next year
SETV appears to be the same as it's been for a while. It's a 60 day tourist visa, that you can then extend for 30 days just like you would if you arrived visa free and were doing an extension.
u can just do TEFL on a tourist visa, its a 4 week course. Or you can even do it online. Really dont think you could get an education visa for a tefl course and even if hypothetically you could it would only be for the duration of the course which is within the visa free window anyways