RE: Designing a plane just for the wind
Notice something about the planes that're suggested as good windy flyers?
They don't have lots of fuselage area. What happens when you have big fuselages? They've got empty space inside. That makes 'em lighter, less dense.
The good ones are dense, with less for the gusts to push around. And dense planes need speed to keep 'em in the air, wind or calm. They also are fast inherently because they have less drag.