IF you can bank the 800K baht in a thai bank account in your name only I'd say come in on a 30 day visa exempt entry and then immediately go to the immigration office and apply for an in country 90 day Non-O visa by showing you transferred the 800K baht in to your account here from abroad.
Doing it that way means you only need the 50K USD covid insurance to get back in (not the
******
and then the 50K covid insurance required when you buy an O visa in the US).