As Bernie said it's been done before. Wingerons, while not normal, are far from unique with slope soaring gliders. The Sig Samurai had them. And there's been a couple of them that not only use the differential wing rotation to replace ailerons but also pitch the wings up and down together to replace the normal stab operation. And you are right about the reduced throw. A guy in my club made a thermal sailplane using wingerons and started with plus and minus 1/4 inch at the trailing edge for a 1/2 inch totoal difference between trailing edges and it was all but uncontrollable until he redid the linkages and reduced the throw to plus or minus 1/8 inch. That's only 1/4 inch total difference between the trailing edges at full throw. Even then it was VERY aerobatic.

A lot of 1/4 midget class models and a few formula one models used single ailerons. I know they have to straighten up but I think they would do this slower than the turn in so perhaps the adverse yaw wasn't so bad. Not sure as I don't pylon race.