@Tom ******
you're getting the cart WAY before the horse right delving down that 'rabbit hole'.
BUT
IT is a valid question about how an OA visa works so I will explain how people get 2 years of stay out of a Non-OA visa that has a single year validity. 🙂
The OA visa is a year-long, multi-entry one. Meaning you can exit/enter thailand as many times as you want during the validity and you'll get stamped in for up to a year (as long as your health insurance is valid for)
SO
If you were to exit/re-enter the country just before the visa itself expired you'd get stamped in for a whole new year (again or as long as your health insurance was valid for) That in essence gives you two years of stay out of a visa that has a validity of a single year.
I'd say concentrate on watching the news, seeing if any of the visa requirements change between now and when you're thinking of coming here.
Get the year-multi OA, have your wife get the 90 day-single Non-O and you'll both be okay for a while once you hit the ground here.