800,000 OR "equivalent" needs be in a bank to get a Non O visa, in the states, Laos or even Cambodia
than transfer it to a Thai bank to get ur 1 year extension at least 2 months before you apply
800,000 needs be in ur thai account 2 months on day you apply for extension.
Once u have a NON O , get a certificate of residence from immigration and shop around till you find a bank that will open an account for you,