We are a couple traveling on 2 dif kinds of visas; mine is a non-imm "O" and hers is a TR. Her visa will be in a 30 day extension period and mine will run out at about the same time. We need an additional 28 days. The plan is to do a quick turn around from Nong Khai and return to Thailand with each of us to enter with an "Exemption". Although this sounds like it will work, with the recent changes, etc, I will appreciate input. thanks,

it should be possible.

No problem to get a visa exempt entry.

You will only get 15 days at a border crossing unless you are from a G7 country.