Interesting solution for old problem. Watch the videos.
Try it with a helicopter with pitch links, Not going to happen, To go with uncontrolled decent from controlled autorotation ,Nope. Army did tests in the late 50s and found the added weight and dynamic problems were not worth it. Too few benefits & added cost & that's that. A looped sling around a standard swashplate/pitch link system ,not good crushed or bent rods in flight will cause massive control problems & have the blades coming through the structure / pilots & pax area. Seen first hand the results of a damaged flight control system, 2' x 4' Pieces when the blades cut through the fuselage of a Bell 206 B III.
Saw the videos ,a trailer doesn't have the same dynamics as a flying machine = invalid tests.