What are the current requirements for obtaining a Non-O marriage visa in Vientiane, Laos?

When you are in Thailand on a family visa:

Before applying, you don’t need to have the money in your Thai bank account for two months. I did it this way: I received the funds from my European bank, transferred them to Wise, and then to my Thai bank. Two or three days later, I submitted all the required documents and they stamped my passport with a 14-day review stamp. After that, you return for Immigration’s decision and they give you 90 days in your passport.

When that stamp expires, they will issue you a one-year visa.

Note: they ask you whether you want a single-entry or a multiple-entry permit. A single-entry re-entry permit costs 2,000 baht, and a multiple-entry one costs 5,000 baht, if I remember correctly.”

Unfortunately, no one can select Multiple Entry for a Non–O E–Visa based on Married to a Thai Spouse

There is generally no seasoning requirement when applying for a Non-O visa based on either retirement or marriage; the two-month seasoning rule applies only to extensions of stay processed inside Thailand. Under the current e-visa system, however, Non-O visas are unfortunately issued as single-entry only.

Sorry but the Thai Embassy in Vientiane Laos no longer issues the Non O Multiple Entry visa as Married to Thai.

They only issue the Non O Visa as Married to Thai with a 90 day STAMP you will get on arrival into Thailand.

To get the One year extension of stay as Married to Thai, visit your local Thai Immigration office for their requirements for the one year extension.

You will need to have proof of a bank account balance of 400,000 Thai baht in a Thai bank account in your name only for 2 full months before you apply for the one year extension.

The ONLY extension available to you as Married to Thai is the 60 day Family Visit Extension...

Thus making it possible to stay in Thailand for 90+60= 150 days, then leave.