@Adam *******
next time you enter Thailand, you will need to TM30 register your accommodation on the Immigration in the Isaan. Then you ask them for a "certificate of residence" for opening a bank account/ changing the address of an existing bank account. With this you visit the bank branch where you live, and have them change the address. I did so with my SCB account that was opened and addressed in Hua Hin, I was able to establish the account under my new address in the Isaan