@Kevin *********
if you look at the criteria closely you will see that you don't actually need the letter from the embassy. The first thing is passport with a valid visa, then it was a list which stated one of the following, the first being a letter from your embassy or an introduction from a BKK bank employee, further down the list was an introduction by a BKK bank customer. It did take quite a bit of time explaining the word "or" because they kept pointing to letter from your embassy but after much dogged determination the manager came out and hey presto the forms started rumbling out of the printer. This was in the Bangkok bank on Phanon Yothin road in Saphan Mai, so not a tourist area