Why not just "TAKE" the time to do it properly and you will have no issues. People trying to get over on the rules makes it a problem for people that follow them. Not rocket science.
I know it has gotten more difficult to open an account, but would suggest Kasikorn. Ask for the manager. You will normally have better luck with him than a clerk. Dress neat and tell him you planning to retire here next year. I think you might get it done. Let us know. Ask the requirements if he gives you a hard time. Might try a little "coffee" money for him if he doesn't budge. Good luck.
You might be surprised at what a little "coffee" money does to get things done exponentially in Thailand. Also, researching and finding out the correct info rather than waiting until the last minute always seems to help, regardless of where you are. Also, as Cliff Sussman stated, act and dress as a serious customer and you might be amazed by the results you see. Thailand, like most undeveloped countries, operates on the theory that most offices expect to be given a bit for coffee just for doing their job. I have lived in Asia for 50 years, and take it to the bank, it is the same in all the undeveloped ones I have lived in. Works wonders!!
Funny how the story changes when you get called on an issue. Why didn't you say in your post you just found out? You are still on the list and you can pi$$ off.
I did read your post, and if the airline has a history of last minute cancellation, which you seem to be aware of, then why would'nt you take steps to insure you have no problems?? Better yet, fly an airline that does'nt cancel frequently. As I said, you made the list.
I know this may sound like a stupid question, but why in the hell would you wait until the last minute? Not like you didn't know immigration would be closed for the holidays. It is no wonder at times many Thai think farangs are stupid. Guess what, you made the list.