I have a type OA visa ,expires the end of July. I intend to get a type O marriage visa as soon as I can go to another country without quarantine restrictions. While waiting for travel restrictions to be relaxed I can extend mo OA visa for two months. Cost 1900 baht. Crossing any border is quite risky at this time. With all the uncertainty easy to get caught up with red tape.
I believe currently the Lab at Suvarnabhumi can only handle 200 tests per day.. However, a great innovative start. Maybe Heathrow might think of something similar or is their brain power already overstretched.