Hmmm - interesting thread, but i can see a lot of unnecessary complication creeping in here. I don't see any reason to directly control the AOA (rel TPP) of the tip, unless it is in reverse air flow (ie very low RRPM vs airspeed).
The ideal blade tip shape for fans and propellers is elliptical, which is generally created by just a circular tip in cooling fans. This is slightly complicated by the need to have an additional taper of 1/radius for optimum disk velocity profile. This results in a good downwash pattern, but with sensibly low tip votices. The efficiency should be able to approach a fixed wing.
If the tip is always operating in forward airflow, the easiest way to achieve this is by fitting a powerfull trim tab to the trailing edge of the tip. In this way the swash plate controls the root, while blade torsional characteristics provide the best washout. This also provides good end damping for Lu's blade eigenmodes.
One comment not adressed, which also favours single swash plate control (other than simplicity), is control forces. If this is for a private helicopter powerful hydraulics are not an option. This means that blade needs to be designed for very low torsional rigidity, while being relatively stiff in bending, and having very good flutter stability.
Not trying be awkward
, but the message is: keep it simple...
Mart