I don't believe it would be 2 switches. A momentary switch (springs back up) would be hooked to 2 circuits; one to kill the injectors when pressed in and one to flick a timed relay to buzz the starter when released. A "dummy switch" to make sure you never restart while in gear (starter relay only passes power to starter motor when clutch fully depressed).
Would be a small circuit board job no doubt. I thought maybe someone has made a kit before (google turned me up empty handed).
I imagine it would be much like the new BMW systems where they restart the car as you release brakes at traffic lights.
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