Assuming you get your 1yr extension in January, you will need to purchase a reentry permit from immigration. No need for visa exempt entry unless you want to invalidate your non-o.
Sounds like you're doing an exploratory trip first. Just go with exempt. When you run and have plans for your move, get a non-o through the evisa system. You can then rent a place, open bank account, etc.
trouble is if you're in Thailand for 14 months and trave to other sea countriesl, your 2yr Thai license is pretty useless but some countries will honor my usa licence even thought the idp is no longer valid