ahh, then you're just meeting the proof of funds using monthly income method by international transfer <- which is totally an ok way to do it 🙂 has nothing at all to do with where who pays you that money, only that you're transferring it in each month, every month for the previous 12 months.
you don't even know how lucky you were 😮 They had NO obligation to let you in on a re-entry permit from the old extension (whether it had expired or not it was tied to the OLD extension and you were on a new one)
They could have told you that you get in free stamp 60 days and start all over from scratch with a new Non-O, then they year 2 months later.
You really lucked out getting stamped in on that new extension with the old re-entry permit. 🙂
boy that has to be a Nakhon Nowhere backwater office because unless you come from a country whose embassy issues the income affidavit notary NO immigration office (that I know of) is allowing proof of foreign income without transferring that money in every month for the previous 12 months no matter what proof you have. .. 😕
You can indeed enroll in a thai language school (you need to enroll in so many classes) to qualify for a DTV, I know several schools that offer the documentation for it
However it's much more consulate specific and not every thai consulate will let you sign up for a soft power DTV with thai language classes, some just won't do it
I know that DLS (Duke Language School, Trendy Building 3rd floor, Sukhumvit Soi 13) offers DTV support if you enroll in so many modules at their school
What you would do is get documentation from your employer stating on xxx date you stop work, get all your documents ready for the marriage extension, go to the immigration office cancel the employment extension and immediately apply for a new extension based on marriage to a thai. You will pay the 1900baht and get an under consideration stamp (usually for 30 days), when that stamp runs down you go back and get the year extension inked into your passport
You can't "convert" a Non-B visa to a Non-O visa inside the country
BUT
With that being said I am doubtful you're actually on any Non-B visa and it's far more likely you're on a yearly extension of stay based on employment FROM an original 90 day Non-B visa.
You CAN change the reason for an extension from employment to marriage to a thai national.
You'd need to have banked the 400K baht in a thai bank account for 2 months before you want to change from employment extension to a marriage extension. AND with over 80 immigration offices in the country you should go to your office and get the hand out listing the requirements as far as photos, map, marriage documents, wife's documents, bank letter, bank statement, copies of your passport, etc. so you know what's what
This is a general list (NOT office specific) of what a marriage extension can require
Sadly, that you own a condo doesn't cut any ice with immigrations if you're trying to come in as a "tourist" on a 60 day free stamp (visa exempt) entry.
Also the proof of onward travel is most often an air carrier policy and they require you to show proof you're leaving in the number of days you get stamped in for if you're comin' here without a visa (visa exempt).
If you manage to board your flight without onward travel you are highly unlikely to be questioned by passport control when you stamp into thailand. You do not have a history of extensive visa exempt entries, (as you said you were previously on a Non-O visa/extension)
As Ellie stated Chiang Mai requires you have a minimum of 15 business days (M-F not counting weekends or holidays) left on your current stamp to apply for the in country Non-O visa thru them
As you pointed out that's roughly 21 calendar days (give or take) so you need to see how many days you have left on your current stamp, take the one 30 day extension if you need it and then apply,
I messaged you before when you tried to make this post and you didn't check your message requests 🙁
As people said, you can apply for a new extension when you have 30 days or less left on your current stamp at most offices (some are from 45 days or less but I don't think Jomtien is).
Slog on over and ask them or post in a pattaya group and see what they say.