Can I exit Thailand and re-enter to obtain my OA visa stamp after being approved while in Thailand?

Of course immigrations here would tell you that the OA can't be used once you're here. it's a VISA you use to ENTER the country and you can't come in on visa exempt and then switch over to it 😕 It's a visa you use to get in to thailand 😉

BUT with that being said, 100% you CAN exit/re-enter the country, showing your eVisa PDF print out (and proof of your mandatory health insurance you used to get the OA visa issued) and you'll be stamped in for up to a year (or as long as your health insurance is good for)

You need to meet the entry requirements to get in (like everyone does with or without a visa) BUT that OA visa is still valid and you should plan to fly out and back to KL or Singapore then show that OA when you arrive.

That's the way to work it, don't even fool with another covid extension (which you do qualify for BTW) Now because you arrived visa exempt that means you would go to the Muang Thong Thani office in bangkok to get one should you go that route.

Personally I'd just plan to exit/re-enter at a country you can fly in in the morning and turn a round and fly right back out of in the afternoon. 😛