Product review (5 stars): Disposal Sink Top Air Switch
This is a unit that does exactly what I wanted it to do. (My wall switch for the disposal was located too far from sink ) Specifically, it will turn on and off the garbage disposal unit. It will allow you to do this without getting anywhere near a wall switch and 120VAC. I prefer to avoid household current while in contact with a grounded iron sink. Dyconn is a 'no-brainer' to connect. Just plug it into the outlet for the disposal, plug the disposal  AC cord into the Dyconn control box. Plug the tube into the button, and be sure to switch on the disposal at the wall switch. Press the button once and disposal starts. Press again and it stops. Great.
I am still trying to determine the best location on counter-top to drill the hole to mount the push button. I do not recommend you hurry this decision. Once the hole is drilled, you will be committed to that spot. Take your time.