So much easier to apply/get the non-o visa while you're still in your home country. Come to Thailand, sign a conditional lease (on your getting your extension} and take that to immigration to get a letter of residency. Take all that to the bank and you should have little problem. IMHO 40k bath is really overkill for the work involved. You have a month to get it together after you arrive.
My credit Union now charges $65 for a wire transfer. Not to bad for 800k, but the monthly 65k would come in at 3.6%. Not sure what multiple wise xfer per month would come out to. For Remitly, I did. $110 xfer and they charged me over $6.