All we would need is a hydraulic ram to exert a linear force 90 degrees before the desired blade position, give it a poke or pull and let precession do the rest.
But of course the helicopter would need somewhere to push from to make it happen - or what happened would tend to follow Newton's third law. Due to gravitation acting on the fuselage, the rotor response to control inputs would vary a lot depending on aircraft attitude and G loading
Awblain, You're on the right (blade) track. A lighter blade system
does react quicker to pilot inputs iaw Newton's first and second laws.
The pilot only has control of the pitch angle of the blades, nothing else. The pitch change rods rotate the blades in the sense of blade pitch; they don't directly push/pull the blade roots. If they did, the feedback forces would be huge and the aircraft would tend to move, whilst the blades carried on in rigidity, iaw gyroscopic properties.