"definitely" teach English? not necessarily, need TEFL or TESOL, degree, which appears they have, but the money, if able to find jobs, is not very much.
the money needs to be documented as international transfers into a Thai bank. this last extension, in cm, they also wanted documentation that the funds transferred came from a pension source.
if ur not in Thailand u would apply for an OA, if u had an O, and left thailand, deapite the red flag warnings, and had transferred money monthly to an acct of yours here, that money is still yours in ur acct.
I have used the monthly deposits for many annual extensions and never had a problem-- yes, there are documents to gather, but I'd rather have my 800,000 available for use, or invested at more than 1%.