Depending on your situation if married you can change reason for O-A visa to married with out health insurance. But this may vary at different immigration offices. I know someone just did in Bueng Kan
Wait till morning & repin your post when the experts are awake. As far as I am aware you need a O visa that does not need health insurance. But you do need to exit country to start process. Having said that not so easy at moment so wait till morning repost if necessary as things are very different at moment