riff_raff,
Your patent for a variable speed transmission c/w elastohydrodynamic lubrication is intriguing and thought provoking.
This is just rudimentary musing but, ~ Without a differential in the power-train, the propeller on the X2 may work reasonably well with only a disengagement clutch and a feathering system.
The range of horsepower to be transmitted by the rotors will be large but their rotational speed change will be relatively small. Might a reduced version of your transmission serve the rotors? Any small slippage can be compensated for by the central processing unit.
In addition, could the backside of your cone (30) provide positive transmission when it is fully 'pressed against the backing crown gear (48). If this is possible, there shouldn't be any loss during hover, a medium loss during transition, and a very small loss during cruise, because in cruse the rotors will be receiving a significantly small percentage of the total power.
Dave