Thanks everyone! We could go both ways, but it would be preferable to avoid locking up the 800K in a Thai bank. We'll use separate Thai accounts (sounds like that's required) and work on documenting each correctly. I now see that we may be able to open a Bangkok Bank accounts from abroad, so that might ease this process of documenting the monthly inflows. It'd be easiest to get the OA visa before we arrive.

Thanks 😁