if the shifter fork is made of aluminum get one custom made outta something stronger. It may sound expensive but check around, try taking the part to a college and have make a digital copy of the part ie in solidworks or any other program and then, shop around for a machine shop that can make it. . . . . if they can and it works, make a bunch of them and sell it
if you have gear wear issues have all the gears shot peaned or cyro treated or both just make sure u have a mint or new gear set.