Look for the mugen starter box, uses two motors and a smaller diameter starter wheel. I too bought it to use it with my fioroni sliding clutch, I have a chrome top ofna box and the wheel was too large to reach the flywheel.
The racers on sgrid rave about this box, says it'll start anything. Uses two stick packs for power, gel cell will not work. It's extremely small and lightweight. I haven't had decent weather yet to fire up a motor with it though.
Here's a review link:
Pro Starter B II