Yes it is, I’ve done that a few time and I always do it myself as it’s very easy. However, the last time the Thai Immigration Senior Officer, gave me a hard time saying the transfers to my Thai bank account have to come from a U.S, government agency, not my U.S. bank. I always use Wise Transfer Service to send the $ from my U.S. bank to my Thai bank. The immigration guidance I saw 4 years ago when I did it last said nothing about my transfer coming from a U.S. govt agency to my Thai bank account. He eventually approved it after yelling. I’m thinking maybe he gets a payoff from the agents foreigners pay to do this for them and he was pissed. I did it myself and he gets nothing.
I know that, but I don’t go that route. I have more than 65.000 TB being deposited into my Thai Bank acct each month, I then get the appropriate letter and statement from the bank in the morning before going to Immigration with the completed form, photos, copies, etc., pay the Visa fee (somewhere around 2,100 TB) and it’s usually done in less than 30 minutes. We live in Samrong, Samutprakan near Bearing BTS, So I go to the Samutprakan Immigration Office.