Is your name listed on the account statement? If so you can try. No guaratees though that they won’t question it. You might want to get yourself a separate account either way as people report that obtaining a bank account even for DTV holders has gotten difficult now.
Depends on your point of application. Each Embassy/Consulates applied different rules. The only hard requirement across the world is the bank balance. You do need some reference though and a company registration, reference letter from an employer or tax return filed as sole proprietor is helpful.
If you live in the Bangkok area you can’t get a certificate of residence until you filed your first 90 day address report. In other parts of Thailand that restriction is not in place according to some reports. You get a Tambien Baan even without any visa but are you planning on purchasing a condo? Because if not, it’ll be very difficult to find a landlord willing to provide all the documents required (lease agreement along with your landlord’s ID and own blue Tabien Baan [if leasing the property] for a simple renter as most often than not originals are required so the landlord has to show up in person.
you can’t apply in Thailand so you need to go back home and lodge it with your local Thai Embassy. But the certificate needs to list regular treatment in the future, not in the past.
Consulate in Frankfurt requested official Girokonto bank statement for one month showing sufficient balance. No printout of the current account balance, they requested the last closing statement including name and address. Liquid assets, no investments.
where do you live? You should contact the visa section of the embassy responsible for you and see if they will give you a reliable answer. Rolling the dice for $400 is a bit of a long shot.