I got my Non-O in Thailand but had to make a border run 25,000b and two days later i had my Non-O . I funded my account with 800,000b with my own money. The bank account was not difficult to open but you will make no interest. You can not make a POD or Joint account . If you die you lose unless a Thai attorney draws up a will naming the beneficiaries and even then their is no guarantee the process will be seamless.
I just opened my account with a small deposit. I now have to make my final 800,000b deposit .Im not looking forward to doing this because of the exchange rate USD to Thai baht but I need the bank account to stay. My story is different then yours i have to maintain my 800,000b for two months.
You can get a Non-O in Thailand with a Visa agent. You need your Non-O application in progress pending approval, deposit 800,000b in the bank . Return to your local immagration office with your opened bank for final approval stamp to convert your tourist visa to a Non-O after bank account is opened. I think i got this right
Im on my way to finish my Non-O application. This will give me permission to open my bank account $800b and finalize my Non -0 for one year. After 1 year I will just show my monthly income . No more 800b required after 1st year. Im doing this in Thailand.