improving this debouncing circuit
The circuit design is almost OK, but the RC time constants of 100k * 0.1uF or 10ms is not OK.  Your large "stomp switch" will likely have a bounce time on the order of 30ms to 50ms.  You might want to be able to repeat stomp quickly, yet filter the noise in between for a reliable single toggle step.

My solution is the change the ratio of (positive feedback)/(low pass filter) from (1/2) to (1/3) so as to reduce the step voltage from the switch but at the same time increase the filter time constant x3 to increase the debounce from 10ms towards 50ms. 

This only requires you change the RC filter resistor from 100k to 300k ~ 330k or more if you prefer slower stomp cycle rates.

Proof concept simulation link this >>   tinyurl.com/rafocgm

There is also a chance of a positive feedback metastable oscillation to which I added 10 pF the switched input.  Short leads in a tight layout may be necessary with a ground plane.  (having some browser issues here)