You can open a Bank account. It's not simple but it can be done. Find an agent and open with Bangkok Bank. Even without an agent some branches will open for you in exchange for a THB30L life insurance policy with their bank but most people eg Pattaya and Phuket are finding it can be done for between THB5K and THB12K inclusive of an insurance policy through the bank
I have been advised by reputable (real person 555) agent in Phuket that they can open a Bank account with Bangkok Bank and have my Australian Drivers licence converted. I am hoping she can do both car and Motorcycle for me. Bangkok Bank will absolutely open a bank account for DTV holder on a walk in basis in both Krabi and Aonang, BUT.... They ask for a THB30K life insurance policy to open the approval gate. The agent in Phuket has advised she can do it with a THB7K accident insurance policy