Can I do a border hop to extend my Non Imm ME OA Visa in Thailand?

i just did this. On my latest OA Visa the "must be used by date is the 9th". Flew back into CNX airport on the 7th and presented my new OA Visa Health insurance and got stamped in until the 6th of next year. After the new stamp I got the re-entry permit.

As long as it's the VISAS themselves that expire on Feb 28th, you can bounce out/back showing the new insurance when you re-enter and you should get stamped in for a whole new year (or until the insurance expires up to a year)

You do NOT get a re-entry permit because the visa is a year-long multi-entry type meaning the re-entry permit is built into the visa

It is not uncommon for people on OA visas to get almost 2 years of stay out of them by getting that new year insurance and bouncing out/back just before the visa itself expires..

Remember though, once you do come back into the country IF you're going to leave at any time on this second "free" year you need to buy a re-entry permit or you'll cancel the entry stamp when you exit the country