Dave,
What about using trailing edge flaps alone, as described in this article.
http://www.ingenta.com/isis/searchin...000002&index=3 The complete pdf file is also available if you google on "swashplateless helicopter"
Also, there is piezo electric "smart" rotor
http://www.isd.uni-stuttgart.de/sfb409/projectA5.html
See other thread on smart materials.
I wonder if some form of "active" gurney flaps might be useful? A gurney flap has the advantage of being very short(about 2% of chord.) A small strip could be easily rotated on its axis.