If I do understand, you have a high mounted non-marginal mass at the tip of the vibration prone mast with a brake powerful enough to stop the rotor rotating quickly before the chutes canopy is fully deployed...
What are we talking then...100kg tot? That is the mass of a passenger with baggages... What represent 50% of this airframe design load.
That's a lot of losses for something that does not bring any advantages regarding autorotation (and even worst: add unacceptable delay to the recovery when most helo accident happen near ground with a forward speed component) and introduces a major risk component to helo design (accidental actuation of the brake system).
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