I'm don't think I'm picturing what Cripple rooster is suggesting correctly, so I might be suggesting the same thing...
Can you set the shifter up with something like this, but put the clutch lever on the end so it only requires one hand still?
Not my bike.
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1973 Fiat 124 Special
1975 Honda Civic CVCC 4spd
1981 Kawasaki KZ750E
1981 Kawasaki KZ650 CSR
1983 Kawasaki KZ1100-A3
1986 Nissan 300zx Turbo 5 spd
1995 Chevy Astro RWD (current project)
1995 Mercury Tracer
2017 Kawasaki VersysX 300
2022 Corolla Hatchback 6MT
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