Your host should do it. You may need a print out of it. I certainly did 2 years ago in Chiang Mai although in other offices I haven't needed it they have just checked online.
You could get 60 days but leaving Thailand, entering on a 30 day exemption and extending for 30 days. If you then still need the extra 30 you would need to leave again.
they really tried for me in Bangkok Bank. They speak good English but showed me the document, recently issued, that shows the type of Visa they can open an account on. Tourist is no longer one of them.
Will there not be a problem opening a bank.account in January. I have tried 2 today and they both told me I needed a Non O Visa first. But I don't think you can get the Non O without the money in a Thai account?