Have not found the necessity to use a foot pedal for the Scropion with use of concentrators. Have set up the torch so that the outer fire always has oxygen supplied. That helps form the inner flame and when the outer is needed it is then only necessary to add fuel to the outer flame.
Many of the NS colors require an oxygen rich flame so IMO the additional oxygen is a plus.
If constructing a home made foot pedal one could be made with an extra valve so that when oxygen is off to the torch the excess is bled off. If an adjustment for that is needed then a simple valve from the pet fish store would be sufficient.
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