Hmmm, bad idea Quadrirotor. Think about the vibration as soon as you put in a cyclic input. The rotor varies from zero pitch/roll torque to max pitch/roll torque every 180 degrees.
I like Dick DeGraws synchropter though. Any more details?
In theory you could run these with rigid or offset hinge, but in practice the pitch/roll torque fighting would destroy the machine very quickly. [ Outboard advancing actually offers better aerodynamic characteristics, at the expense of needing gyro stability augmentation. ]
Agreed with the idea of rigid gyros though - too many reduced g accidents. Why don't you consider a twin two rotor assy? For stowage the upper rotor could be turned through <90 degrees. This means there is no risk of in flight unbalancing if the rotor is not correctly fixed (look at Apache tail rotor).
Mart