Imagine a path that lets you keep the 800,000 THB in your home bank account earning a good interest, and never have to park this kind of money in a Thai bank account. There actually is a way to prevent parking 800,000 THB in a Thai bank account for the first year Extension of the Stay Permit.
You could actually use the 12 months of 65,000 THB transfer method in the first year of an extension of stay out of a Non-Imm-O Visa – but you must start out on a Non-O/A Visa first.
It is theoretically possible, if you happen to already have collected the 12 months of transfers when you apply for the 1-year extension.
It would be possible for people who first start out on a Non-Imm-O/A, leaving their 800,000 THB equivalent in their home bank account earning interest, then enter Thailand, get a Thai bank account opened and start to transfer 65,000 THB minimum every month, month for month, not missing out a single month.
Then in the second year of the Non-O/A, they would exit without a re-entry permit and thus invalidate the stay permit.
Now they can apply for the 90-days Non-Imm-O Retirement Visa, re-enter Thailand, and all the while they keep going on with the monthly transfers of a minimum of 65,000 THB.
Now, for the application to the 1-year Extension, they can use the 12-months 65,000 THB bank statement.
As there are so many people who wish to get off the O/A Visa to escape the mandatory insurance AND simultaneously avoid to park 800,000 THB in a Thai bank account for the first year extension of stay, this is a pretty viable option.
By this way, US, UK, CDN and AUS citizens NEVER have to park 800,000 THB in a Thai bank account
But keep in mind, you would have to start out on a 365-days multi entry Non-Imm-O/A Longstay Visa, which requires a police check, a medical check, and an approved mandatory health insurance