a ball ache and I think it's around £50 as well, better to us a bit of patience to explain the meaning of the word "or" as they do like to try and insist on the letter as it's the first on the list.
the Bangkok bank will give you a list of requirements when you go to open a bank account, one of them is a valid passport and visa then there is a list of about 10 things that you need to provide one of, one of them is notarised letter from the embassy another is an introduction from a Bangkok bank employee or a Bangkok bank customer. As the missus was a Bangkok bank customer I got my Bangkok bank account this way, it did take quite a bit of explaining their own rules but eventually I got an account, it was a bit of a ball ache but not as bad as having to go to the embassy to get my passport notarised.
basically if you don't have a full motorbike licence from your home country you won't be able to get an IDP with motorbike entitlement. This means that not only will you be unlicensed and uninsured but if you get stopped you will have to pay the no licence fine.
When I brought over large sums of money I used Bangkok bank the charges were £15 per transaction which was ok considering I was sending a few million bahts worth at the time.
Wise has a limit on the amount you can transfer so not great for larger sums.
Taxi from Bangkok to Koh Chang should be between 3000 and 3500, this will take you door to door, if there is 4 of you this is great value and much better than being on a bus or minivan.