Your lever on the trans if made longer, that would solve the problem. It looks from you picture you have room to do that. The factory Rube Goldberg design was because of oil tank interference. It also appears your lever for the shift pedal is shorter than stock this is a help. The length above the heim joint on the forward linkage is what you would need to increase the length of the rear lever if the stock shift pedal linkage was being used. It your shift pedal linkage is shorter, your rear arm on the trans would need less lengthening than for a stock shift pedal linkage.