I discovered that if you are careful, you can run the non-340 over-center spring with the CF-II, Even granma can clutch mine, and modulation is a dream.
The careful part is limiting the pedal travel to use only as much as you need to satisfy departure and to allow a clash-free shift into reverse. You can either put a block under the pedal, or run a bunch of freeplay, or whatever else you can think of. This is to prevent the pedal from sticking to the floor.