fabricate a bracket to get them on the same plane. Without seeing the entire setup it's hard to comment on any other solution
EDIT:
If the lower cable is the throttle and the upper is the cruise, doesn't appear as though it would be that hard to tack weld a tube to the side of the bracket that clamps the throttle cable.
If said tube had enough wall thickness a couple of small set screws to position the cable and attach it to the opposite side of the throttle arm