A friend of mine made his own custom short shifter. He cut his stock shaft and installed a carbon fiber knob. He'd shorten my shifter, but I'd have to get the shaft rethreaded if I wanted to use my stock knob. Shoot for some time taking measurements and cutting the shaft, it's better than paying a bill or two for a short-shifter.
This doesn't do anything.
The short shifter had a different fulcrum point, and this is what gives the shorter shifts.