That’s about right. I had a similar value in records sent here and paid about the same as you are being charged. There is a notice at my local post office, anything received over 1700 Thb is subject to import tax / duty.
Yes. Wise is basically just another bank account. You will need the payees full name, bank details and possibly for setting up the payment their home address.
It’s quite straightforward on their app. If you’re uncertain just send them a small test payment first.
just before covid was the last one. I then went to yearly extension of stays. The KB consulate website was kept upto date and I never had any issues getting a non imm o multiple entry there.