Banks can be difficult however you can with a DTV my friend did, I have a couple accounts (different visa) however I mostly use the TrueMoney app for day to day spending very convenient I highly recommend!
thanks looking at long term with possibility of permanent residency if that was possible under marriage visa will probably go down that route despite the issues that come with this visa type
If staying at GF home you need to register (online) when you arrive. Then take passport 1900 Bhat and copies of passport page and arrival stamp. Although most immigration offices have photocopy shops. DM me if you want further help