Presume you're wanting to shift at full throttle without the clutch ?
Leastwise with a Banshee they cut the engagement dogs on the gears, some modify the drum also. Plus springs are added to help force things along.
Drawback is that you can't backload the trans. You have to pull clutch in at end of run, no engine braking. Look into getting a ceramic ball for the clutch, I don't think there are pancake bearings available.