I am a US citizen, married to my Thai wife for 35 years. We moved to the US in 1989 on a fiancé visa (for the Thai citizen) and married 2 months later. My wife waited until 2003 to become a s citizen (dual citizenship). My wife owns land in the US (jointly) and owns land, houses and pickup truck in Thailand. We live in Thailand for the 6 months of winter and the US for baseball season.
I live in Ratchaburi and did mine at Poi Pet, Cambodia. Drove to the border with friends, they waiter the 2 hours on the Thai side. Went smoothly. Cambodia immigration had me talk to the desk supervisor because I was doing an actual border bounce, but I listened to him, thanked him for his advice and then carried out my plan. All good. Probably better than Ranong because that is Myanmar.
So, currently you have a visa exemption or a tourist visa? You need the Non-O first, then the bank account. Just so you know it can be done. My Thai wife and I have never/will never pay a bribe, have never/will never hire an agent, have never/will never pay for bank account insurance.
When we return in October, I will close my bank account at Government Savings Bank and move my B400k to Bangkok Bank or Kasikorn.
You are on the correct path and you have the most difficult parts completed.
You need a photo of you and your partner at the front of your home showing the address. Go to Home Pro and get stickers-on numbers if needed. You need a photo of your wife and you in your bedroom (I’m not making this up) and photos of you and your wife in a couple other rooms in the house.
And of course because it’s Thailand, they have to be printed in duplicate.