What are the options to convert my METV to a 90-day Non-O visa based on marriage in Thailand?

Leave Thailand , apply non o, come back, then do extension with marriage documents

Hello, can I ask how did you get your bank account on a tourist visa? I can’t open one for my husband so we can’t get the non-o visa marriage inside the country…

In theory you can convert but heard plenty of stories of it being if the Immigration office feels like it. Easier for them to tell you to leave the country.

You should go to the immigration and ask them, tell your wife to go with you, she speaks Thai, it's much easier. I never deal with my visa, my wife gets it done for me every year, I just follow her to immigration, I give her any documents she asked for and it's been like that since 2010.

Go and see Thai Visa Centre

Congratulations

I did read that need to be married 2 month before can apply. That maybe depends on the office you going to. Might pay to check their requirements.

Most immigration offices will require you to be married for 2-3 months before they will allow you to convert to a non-O visa based on marriage inside of Thailand. That means you won't have enough time based on your current permission to stay. You will likely either need to leave Thailand and then apply for a non-O visa from the Thai embassy in the country you leave to, or you will need return as a tourist again and wait until enough time has passed for you to be able to apply inside the country.

I would recommend going to your immigration office and asking for their list of requirements to do the conversion, and also ask them how long you have to be married before you're allowed to do so. You can make a plan based on what they say.