how about a coaxial blade positioning system in which one blade is positioned in the bottom and another in the top driven by seperate motors. The bottom blade is fixed and generates thrust exclusively. The motor is mounted rigidly on a plate that can incline through small angles to generate forward, backward and side force components which will permit directional control.
take off, landing and hover: both motor axis are coaxial
forward flight: top motor inclined forward
backward flight: top motor inclined rearwards
side flight: top motor inclined either rightwards or leftwards depending on the desired direction of side flight.