That confirmation isn't probably what Bangkok Bank means by this strange new rule. The reason might be borrowed money from agents,and they want to make it harder for them. I don't know,and I really don't care. It doesn't affect me the least. I've had my money in my accounts many years.
It's totally ok the way he's thinking.If he return back home after he opened a bank account in Thailand and over time transfer a total of 800k into his account, then when he's back in Thailand when he's retired,he basically just has to kill time until the 1 year extension. He already has the money needed in the bank,and it's smarter to apply for the Non-O back home instead of doing it in Thailand. It's only one visit to immigration.
When you get married in Thailand with a Thai lady, you register the marriage at the district office in the province where she's staying. This is very simple and cheap. When it's time to apply for a 90 days Non-O visa based on marriage and later the 1 year extension based on marriage,it's just copies of the marriage license/certificate (one per application stamped and signed at the district office) needed. In total 2 copies. A total cost of maybe 100 baht. That's all you need at immigration regarding the marriage, one piece of paper per application.Does this seem complicated to you? Like I said, it's a walk in the park.