You find a school/gym who will support you obtaining a 90-day ED visa and subsequent extensions every 90 days.

A Muay Thai education visa does not qualify for any dependants, so spouse and children are on their own to qualify for their own visas.

A Muay Thai 5-Year DTV visa would qualify for dependants but is going to cost 50,000 baht per visa, plus whatever the course costs that you register for.

Who said you need to go to your home country? Only a very few specific visa types require you to apply from your home country. Most others can be applied for in a country neighboring Thailand.

The e-visa system doesn't check your location. It asks you for your location so it can route your application to the correct embassy. But then in the application you must also upload proof that you are physically in the location you stated. This is normally by uploading the stamp in your passport from entering that country.

The embassy can also summon you for an interview or ask you for other things to prove your location after you submit your application, so they can check that you were there when you applied and that you're still there afterwards. This might be something like all the pages of your passport, your paid hotel reservation with a letter from the management. A receipt from a local cafe, etc.

Last month someone applied for a DTV from the Thai embassy in London and received a request to attend the embassy in person with only a 2 day notice.

If you say you are somewhere and they find out you lied, your visa application will be cancelled and you will not be refunded.

@Martin *******

then your only realistic option without border bounce is non-OA visa but you'll need to purchase 1 year of compliant insurance from the embassy list. Otherwise get a 90 day non-O and then do a border bounce.

You're not on a non-O visa. You're not on any visa. You're on an extension of stay. I'm guessing that's based on marriage.

Some immigration offices have even started stamping in your passport that your account must remain at 400,000 baht until you go back in and receive your full stamp.

You can do it, but you need to know there's a risk involved. We always tell people not to touch the month until they have the full 1-year extension.

Most likely you'd only get a warning for this year if they decided to check, but there's always a small chance of worse outcome.

@Michel *******

no, you didn't. The non-O does not require proof of insurance, health certificate, or criminal records check. Only the non-OA requires those.

First of all, the non-O visa doesn't require any of that. So you are applying for the wrong visa.

Second, all the requirements are on the embassy website.

@Jan *****************

@Nongnuch *******

is this something either of you know about?

Non-O visa based on marriage to Thai.

Why is your plan to enter as a tourist? That's the worst plan. You CANNOT open a bank account as a tourist, and the money in the Thai bank is a requirement to apply for the non-O visa in Thailand. Therefore your plan is impossible.

Visas are meant for entering countries. So do it the way it's meant to be done. Apply for the non-O visa BEFORE you travel to Thailand from the Thai embassy who will accept any bank account. Then use your non-O visa to open your Thai bank account that you'll need to apply for the 1-year extension.

@Jeffrey *********

an education visa is just a visa people use to stay in Thailand. There's no law that says you must be on an education visa to attend a school. It's the school first, then the visa, not the other way around.