dual magnito possibility
RVator51
I don't know if it will help, but I used to fly an old Piper Seminole and I remember the mechanic telling me that it had dual mags but only one drive coming out of the accy case. The timing was set by rotating the dual mag setup with the single shaft either clockwise or counterclockwise. If your current case had the room for two mags behind the motor then I don't see why you couldn't set it up that way.
Ask around for someone with more smarts then me to see if it can be done using this "dual Mag" one drive unit.