That's strange as SCB is one of the Thai banks that are explicitly listed on their THB transfer guide, which mentions property purchase: https://wise.com/help/articles/2932335/guide-to-thb-transfers
If that's the case then I could open a Kasikorn account.
After receiving THB, would it be OK to move it out to other banks? I have high interest accounts at other banks, so want to be earning as much interest as possible whilst I spend some months looking for property. Would Kasikorn still create the letter at a later date even though the account that received the international transfers had been emptied long ago?