I've been a satisfied customer of travelingmailbox dot com for 9 years. Envelopes are scanned, contents scanned on request, mail such as credit cards can be forwarded to Thailand by USPS.
I believe it is a very bad idea to inform US financial institutions that you don't live in the US. Use a virtual mailbox as your address (or friend or family's residential address). US financial institutions do restrict and close accounts of people who don't live in the US. Use a VPN set to the US to access your accounts online. Use something like Magic Jack to maintain a US phone number. Use free Google voice for a phone number in the US where you can receive SMS or 2-factor authentication. Sounds paranoid? Once they restrict or close your account there's nothing you can do to fix the problem. Avoid the problem in the first place. US financial institutions that don't care where you live *today* could start caring tomorrow. Things change, know your customer (KYC) laws get stricter.
I can't cite the law that requires Phuket Immigration to grandfather people who were on an extension derived from a Non-OA issued before 2017, but that does seem to be the policy of Phuket Immigration. I've not heard that the same grandfathering policy is in effect at any other immigration office, including Jomtien, unfortunately.
agree, maybe the problem is that on my phone I can't read long OP if they choose a gigantic font. Sorry if I missed something in the OP, but more... doesn't work.