I even used travellers cheques until I opened accounts here, I never ever use my UK or HK cards as its wayyy too expensive. 200Baht fee in atm, then barclays add two further costs.
barclays does same with a no fees international transfer, it works out more cost effective to use wise with a transfer fee as the rate is so much better.
are you sure? My wife had HSBC in UK but was charged for using card here, I have one in HK same thing, I also looked to transfer from HK to K+ but it was better to transfer from HK to K+ using wise.