Stephen Anthony. That's a bit of a wild statement at this particular juncture. All neighbouring countries are closed and the OP would be required to do 15 days quarantine at each "bounce". Each bounce would require flying to another country, complying with any quarantine requirements there, applying for a new COE, booking ASQ. I actually think the Elite Visa would be cheaper and certainly less hassle!
Michael Dawson. Correct. Many embassies have not updated their links. TR visa can definitely be changed in-country, and WITHOUT THE HELP OF A VISA AGENT!!
Justin Langley. This section has been removed. Whatever you do DO NOT GO TO A VISA AGENT. You can change a visa extension yourself for 2000 baht at immigration. An agent will charge you minimum
Arnoud Zwemmer. Absolutely, if you have other business at immigration it's worthwhile to do it all in one go. The app is so easy to use it's laughable. I kick myself for not doing it sooner!
I know the red line is free, but why wouldn't you just use the BTS? A lot easier than messing around at Bang Sue for a train which runs only every 30 mins