Was thinking about this..Still I think
mobile Android version is a better choice to be used with a hardware midi pedal BT or Wireless or even wired. You can get an inexpensive phone that will have guts much more sophisticated than most of pedals...why be hardware dependant/limited? So at the end of the day you have your hardware pedal with hardware processor (phone) and if you feel creative, you can built a custom wooden case that would house pedal and phone.. so you have yourself a touchscreen, fully programmable midi pedal.