Electric motors and piezo actuators work for me. The difficulty for direct blade actuation is always designing for high g and supplying control signals and power. Slip rings are bad news, but brushless AC makes sense.
There would be large benefits in a blade with variable camber, particularly if system was fast enough for a cyclic control. Thin cambered aerofoils prefer a narrow range of AOA, with the point of stagnation right at the leading edge. If blade could be pitched to keep front aligned with incoming air, camber would produce lift control. Ideal operation would have blade operating close to stall (Ct/sigma = 0.125).
The downside is varible pitching moment, which puts more load on swash plate and hydraulics. Perhaps for this reason a better design is variable chord in a constant camber design.
By the time this has been optimised it will likely need many CFD/Tunnel/Tower hours to produce a marketable solution. Best a privateer can do here is to demonstrate a concept system...