How about letting someone trustworthy know where your cc is and also provide hin/her with the number upfront. I would consider my parents or good friends that would come over after my death for example. Clear out the account via atm should be possible in a couple of days. With a german cc I could withdraw 400.000 Baht per day (several years ago; 40.000 Baht each time and then just inserted the cc for another go). Not sure about thai cards though.