When a biplane has ailerons on just one wing, when those ailerons move, it encounters an imbalance of drag between the two wings. The wing with no ailerons produces no extra drag while the with with them sees lots more drag. The imbalance would produce a pitching force. The nose of the airplane would try to pitch in the direction of more drag.

Whether or not the airplane could get by with less aileron force isn't the important part of your idea. You probably won't benefit from building less ailerons as much as the airplane's flight characteristics would suffer from the induced drag imbalance. It certainly doesn't seem worth it to me to "redesign" the plane just so you won't have to build all 4 ailerons.

It appears from the popularity of the Hog Bipe that it flies really good as designed. I doubt that it would fly as good and be as easy to flight trim if you changed the aileron design.