Okay, for the record, my Isuzu can indeed run circles around my Getrag. And, my Getrag can run circles around the Isuzu, too. See, you go to a big parking lot, park one car, get into the other and drive around the
first one...

What about an hydraulic linkage? You guys probably think it's a dumb idea (you are usually pretty perceptive), but I think I've seen hydraulic throttle kits used on hot rods before. The forces we're talking about for a shifter are really pretty small (versus what the clutch & brakes see), unless you use you feet on the shifter.
Yeah, you'd have to solve the push-pull thing (with return spring(s) or more hydraulics or whatever), but it'd sure be flexible. And think how much fun you could have bleeding it all! Kind of a half-baked idea, but food for thought, maybe.