Here's another possible solution and I just tried it out for you on my bike, as in on the stand in the garage, I did not try to road ride it, but am very sure I could if need be.
Get a needle nose vice grip, smaller size, about 6 inches long overall.
Clamp it on the lever arm down at the clutch. (You'll chew up the lever arm a bit, but if it is that desperate, do you really care ?
Hook your foot in front of it and actuate that way.
Do clutchless up shifts.
Try clutchless down shifts too.
Try for neutral if forced to come to a stop.
The clutch actuation arm does not need that much force.