I am on my third waiver myself already. It's just unsustainable if you don't wanna get an education degree. But for a temporary job just any degree will do.
If one of the conditions of the visa is the two week quarantine, it would make absolutely no sense to include foreigners already in Thailand. Maybe for business it would. 555
You can't just become a teacher in a Thai school. You need a work permit and for most public and private schools you must have a teacher license to obtain a wp. It's not that easy if you wanna do it legally.