Seems like I spent hours in the hangar today and accomplished nothing. Ah! but I did figure out something I've been noodling for a very long time. So that was something, and if it works, something big.
Here is my idea for the Toe Brakes. The handles are some sort of plastic, hydrolic setup. You've seen the calipers. Pic is a short video (Double click it use space bar to play). I can't see any reason this wouldn't work with cable brakes as well.