You've got a bank account. You put required money in bank. Head to neighboring country, apply Non-O retirement e-visa ( NOT O-A ) and use entry stamp with accomodation booking to prove you are there. Re-enter Thailand and do 12 month extension of stay. It's been explained by others too.
no idea what my plans are as yet. I'm not worried about it anyway. Just curious how Thai tax office will contact tourists who might spend over 180 accumulated days in Thailand, and tax them on what?