RE: How will it fly, what should I expect?
As I was reading, I had the same idea as TFF... use the right aileron only. The upward deflecting aileron during left roll is lifting airflow off of the stab, changing the effective angle of attack of the horizontal stabilizer during the left roll.
You might try building an aileron with a little more chord... but I'd think you may not need to. Fly it single aileron first, and go from there. Is there any way you can mechanically lock the aileron in the "trailing" position... you might just be able to do it with a mix, just for testing purposes... in fact, that's exactly what I'd do... set up Right aileron as master, left aileron as slave, assign it to a switch so you can turn the left aileron On or Off in flight...
Neat project, great "Out of the box" thinking!!