I have been back in Australia for over 2 years, before returning I set my mobile number to Roaming, now I have no problem operating my Kasikorn Account from here as I can receive the necessary OTP when required, I use Kasikorn account to Top Up my Mobile Number when required.
If you have a Thai friend you should get him or her to Activate an AIS Sim, set roaming up on it and send it to you and then register that number with your Bank, the fact that the number is not in your name should not make any difference.
I may be able to help further if you need it