How can I transition from a marriage visa to a retirement visa in Thailand while meeting the financial requirements?

First I want to thank any responders in advance. I also want to express my appreciation of this form, I keep learning from it.

I am a US citizen and I am 71 with several questions.

I currently have a one year multiple entry marriage visa. For complex personal reasons I will likely need to change to a retirement visa. I have 800K baht in a Thai bank account. I have monthly social security income that will more than meet Thai minimum requirements. and can be direct deposited to a Thai bank.

I do not think have the funds to apply for any of the newer higher cost visas essentially established to attract wealthier retirees. Although, if the one that costs 50K baht were for some reason strongly recommended, I could potentially save enough before a move to apply for that one.

Any suggestions or recommendations about converting from a marriage visa to a retirement visa?

Since I need my social security to live on in the US until a move here, how can I transition from the 800K baht in a Thai savings account requirement to demonstrating I have sufficient monthly deposits to meet Thai requirements?

If I have sufficient monthly income, does that eliminate the requirement of maintaining $800K baht in the bank

I am confused by insurance requirements. Is there any way to demonstrate sufficient income so that the insurance requirement is waived?

If I need the insurance, who will insure an older gent at a reasonable cost for the Thai minimum coverage?

Any information will be greatly appreciated.

Steve Mussack