Helicopter with rotating push rotor

The new Sikorsky S-97 model which uses the  push rotor to speed up the flight I am more and more sure that half turned back rotor as awkward it may look will find its way.

Coaxial counter-rotating main rotors stabilize the rotational torque of the helicopter to get rid of the traditional back rotor (as in Russian KA 52).  But the second row of blades with extra controls and transmission complicate the machinery, hence cost... 

My offer is to leave one traditional row of blades, but turn the back rotor with a counted angle. 

I think such attempts were made before, however, they probably used mechanical synchronization. Nowadays with all the quadrocopters and electronically changed fan speed it could be possible to precisely adjust the compensation speed. The part of the back rotor energy will push the helicopter forward  ( the main rotor will speed up or turn to "forward" as well). If not mistaken such helicopter will have to move forward from the beginning (slowly up and forward, without any runway) - if so it is noticeable but still acceptable restriction in many fields. 

If hovering is essential, the angle turning mechanism could be added. Just turn to traditional position... 

Benefits cheaper than S-97 and faster traditional.