Education visa and “tourist” are mutually exclusive. If you’re here on an education visa, you’re here to get an education. The fact that tourists have historically used education visas (& that’s become more difficult due to abuse) does not change its definition.
You can find numerous things to study on an education visa. The obvious ones are Thai & Muay Thai. One can also go to university and study a plethora of subjects. Cordon Bleu has a school in Bangkok if you want to be a chef. I’m sure other schools exist as well. I know of no exhaustive “list” anywhere.
I’m aware. As I said, “very few”. Yet, as you pointed out, the laws are still different. So, again, I say…”anyone from elsewhere advising you on what was required” from their experience “does not know”.
I do think some of the laws are whacky. However, I am amazed when farangs complain about meeting some of the immigration requirements when Thais can rarely even enter the farang's home country.
I've been in the "community" group for Siem Reap for years. I had considered moving there as an option as well. Numerous people have moved from Thailand to SR and they seem very happy. Is life more simple than in , say Bangkok? You bet. That's why they love it.