I'd suggest that an aero tow might challenge a helo pilot a bit,
It took me about 3 hours to solo the glider, and 20 to solo the heli. When I soloed the glider it was no big deal. When I soloed the heli I was, to put it mildly, nervous. Yeah, aero-tows take a bit of getting used to, and early release is a bit of a surprise when you're used to powered airplanes.
But it isn't the same league as far as learning curve goes.
n5296s