They will see your latest tm30 as soon as they bring you up on the computer. I've never brought a tm30 receipt to anything for immigration in hua hin. I just being copy of my lease
SWIFT is flat rate so (unlike Wise) larger amounts are lower cost. My monthly transfer used to average about $26 in fees from wise (small amounts like ฿70-฿100k). Large amounts like ฿800k would be excessive. It costs me flat rate of $15 to send via SWIFT regardless of amount. Always send in USD and I usually get near mid-market rate from Thai bank.