used to the reason pros did it was tire clearance and some sort of compliance (e.g. the roubaix for roubaix). he just does it because cannondale is his main sponsor and they have a new bike?
think your only option is probably rotor spindle or spider options or one of the left only options. you might be able to find one of the (discontinued) easton cinch pms to pair with their 46-30 rings.
both the genesis and the rock lobster are sick.
i thought about doing a similar build with the pinnacle lithium reflective frame before i got an omnium