@Daniel **********
. Okay lets look at your options.
You can't apply for ANY in country Non-Immgrant type visa once you're on the amnesty, you need REAL (hard stamped) days left on your stamp. SO here's a question:
You said you entered on a 30 day visa exempt entry stamp but that expired and you're now on the automatic amnesty.
DID you get an normal 30 day extension at the immigration office for 1900baht on that 30 day visa exempt entry stamp?
IF the answer to that is NO, you could go just before amnesty runs out and apply for the 30 day extension
IF the answer to that is YES, then you could still do it by applying for the 60 day visit thai family extension. The whole purpose is to get you OFF amnesty and back on a real "hard stamp" stay.
THEN by meeting the requirements (400K baht in a bank account in your name transferred in from overseas) apply for an in country 90 day Non-O visa based on marriage to a thai.
The application would go under consideration for 14 days and then you'd go back and get the Non-O visa and a new 90 day stamp inked into your passport. It costs 2000 baht at the immigration office for a 90 day Non-Imm visa..
Once you got that you wait until you have 30 days left on that new 90 day stamp and for your 400K baht to season in your account for 2 months and go back and apply for the year extension. It will go under consideration for 30 days and then you go back and get it inked into your passport.
The hard costs work out like this
60 day visit family extension to get you OFF amnesty 1900baht
90 day Non-O visa based on marriage 2000 baht
year extension 1900baht
re-entry permit 1000baht - single, 3800baht - multiple.
It is a multi-step process BUT it is not beyond your ability to pull off if you face each step one at a time.
Good Luck,