I'm all for ballistic chutes for rotorcraft and welcome a design specifically for them. Having said that I'm less concerned about a bridal that works with an intact rotor. I don't see the need when the rotor is intact. I see it only being used after a catastrophe failure like a rotor strike or other structural failure in with case the rotor has most likely departed and the ship is tumbling. I think I'd feel better if the system was attached to the frame instead of the rotor head.
I have a Challenger with a top of wing mounted BRS. Since it's a pusher the BRS sits in front of the engine and prop. A deployment while the prop is powered could be a big problem.I believe that an accidental chute deployment poses a greater danger than anything else is likely to pose.