in the past I’ve got non imm O based on marriage from Kota Bharu in Malaysia and Ho Chi Minh just by showing more than 40,000 a month deposits into a thai bank.
I send a larger amount every month to my bangkok bank account. It always arrives at 2pm the following day. Amounts less than 50,000 are usually within seconds
I was previously on an extension of stay based on marriage. It was due to expire when I was out of the country. To prevent having to start a whole new non O process I was able to convert it to an extension based on retirement. It’s the easiest solution, which you could do now.