to add, you must show proof of need for the METV so, a ticket out within the first 60 days you'd be stamped in for, and a ticket back sometime after that.
Although I don't bank with K Bank, and Bangkok Bank at this time is seamless but for instance SCB there is a single transaction limit of 50K 200K daily, but if you need to transfer more you just have to request it by calling customer service or going into the branch. I'm pretty sure K bank has alternatives available.