points out, do check it shows as a foreign transfer from TW into your Thai account. Although, logically, it should because you can hold different currencies within a TW borderless account.
The best way is to test it, see what is shown, and also ask the branch when you have your bank book updated. Some of those forums are out of date and also inaccurate I find. But I guess if it was a common way of doing it, there would be more posts about it, I agree.
Yes but you could transfer the money x2 (or x4 whatever you want) into the Transferwise account ahead of time and then do ONE transfer from Transferwise of whatever you want (certainly up to $3,000) to your Thai account.
If you want a long term option. Get tourist visa and then use an agent to buy a retirement visa when you’re here ( around £800 for a year). If you want a short term option just get a tourist visa.