@Janin *****
I wouldn't want to count on those changes being as favorable as I think some are anticipating. Immigration will still dictate the coverage minimums which are not good (see earlier comment). Getting your insurance company to agree to certify that they meet Thai requirements is not as easy as some imagine. Getting Thailand to accept your insurance company's certification is problematic (Thai immigration is likely to want your embassy in Thailand to certify). Reports of a change in the media are often very different from reality when the change is implemented -- the devil really is in the details.
In my opinion, you don't want to be saddled with the Thai immigration insurance requirement forever. You will be if you go down the Non-OA path. You won't be if you go down the Non-O path. Yes, initially it is easier to go with the Non-OA (which you can get in Australia) but understand that once you go down a path you can't easily (especially in covid times when entering and leaving countries is not easy) change from one path to the other path.
Here's my point in a nutshell. Immigration matters should not be connected with your health insurance. In other words, this is what I need to do for immigration and this is what I want to do for my health insurance should be entirely separate things. Mixing them together is not a good thing. Non-O keeps them separate. Non-OA mixes them up together.
The Non-O is initially more work, but once done you can renew year after year without insurance worries. The Non-OA is initially easier, but once done, year after year you have to deal with insurance worries. As they say in Thailand, up to you. ;-)