But to get a Non O retirement VISA not need Thai account, but only 3 months then convert it hete to 12 months extension need no problem many many 1000 makes every month
The VISA non O retirement is only 3 months visa and not need that money in a Thai bank its then you arriwe in Thailand and acter 3 months you apply for a 1 year extension of Non-O visa you need the 800.000 B in account.