The only problem would be the over 50,000 baht limit. Best go with Bangkok Bank direct deposit from SS and pay a 15 baht fee. Then transfer it to a fixed Bangkok Bank savings account.
From what I read a year ago, there is no cost if going through US social security through the Phillipines. Let me check my Bangkok direct deposit and send a photo.
Give them your Thai address and tell them u want to deposit directly to Thailand. They will send u the form. Send it back to them only. Bangkok Bank has the same form bit takes months. US SS Phillipine took deposited my money in less than a week.