Yes indeed there are other simple solutions although not as often used simply because warping is so easy and effective contributing to for example a great flying but heavy tricked out warbird.

One of the first is the very simple expediant reflexing both ailerons "up" above the intrail neutral position just a few degree. This is done just by a few twists of some clevis on both side.

Another method is to trip a stall at the wing root first before the tips simply by the addition of a sharp corner on the leading edge just in the area of the roots. This method is very common in the full scale world and used on most Mooneys for example. On our airplanes just glueing on a bit of tri stock just to the wing roots leading edge does the trick.

There are other methods that are not so practical for our purposes also such as airfoils transforming from ones of different stall characteristics at the tip and the roots.

John