I think it's easier in a tourist area. I have accounts with three Thai Banks. Krungsri just required a passport and Kasikorn and SCB wanted a passport and a rental agreement as proof of address. If you get a no just go to another bank or another branch of the same bank.
You can transfer more than that. I've had clients transfer 1 million dollars here without any problems to buy a property. Over a certain amount they just need to know what is the purpose of the funds. Those are Bank of Thailand rules so you would get a phone call asking you what the funds are for. As far as I'm concerned the minimum amount before you have to give a reason is 20,000 dollars.
the transfer fees are lower than from Swift transfer but it gets to a certain point which I haven't worked out where a large amount would be cheaper by doing a swift transfer but the Wise app has a calculator which tells you exactly what the charges are. Apart from the transfer charged you also get the mid rate which can make a big difference.
When I do a SWIFT transfer from Nationwide I just use the Swift code. Forget about IBAN. But it never do it that way now. I use Wise and save a lot of money. I would strongly advise your bro to open a Wise account. When I transfer from Nationwide to my Thai bank account the money is in the account in about 2 seconds at a guaranteed exchange rate.
They are asking you to open it on a PC because the malware or virus is designed to infect a Windows machine. If it was a legitimate document such as PDF or DOC there is no reason why you can't open it on a mobile device.
I think you got the correct advice from the Bangkok hospital surgeon. A CT scan is more appropriate than MRI for bone and hard tissue imaging. And after all it was the CT scan that detected the bone spur.