No, you cant do that. The spline has 28 teeth on the shift shaft, the Rizoma has 34 teeth. If they had the same amount of teeth, then you would have to flip the lever around. 2 right side shift levers would accomplish the gp shift (if they shared the same spline design....i should be a rapper) You can flip the lever around and move everything to the other side but the revers side is not CNC'ed the same and the rizoma logo would not show (not that big a deal).
Thanks, Tony. I've been looking at the Rizoma rearsets myself and got a little excited wondering if that lever would "flip around". It's too bad there's not a set with everything included.