Hi Banking question for you knowledgeable folks

I have an account with Krungsri Bank which unfortunately limits transfers via Wise to 50k baht per transaction I’m in the US now so considering transferring a larger amount via IBAN (bank to bank) Am I still restricted on the amount and will I benefit in regards to fees? Thanks

Asking for my bro. He has a building society account in Uk (nationwide), has opened a bank account successfully (Bangkok), he cannot transfer money into Thai bank because IBAN and Swift not work, is this a normal problem?. I can get him to transfer money into my UK account and pay into my Thai account but want to know if building society is the issue here. TIA.