For a simple lever type unit your math also needs to take into account the angle of the lever over the travel range you want. Unless you have a ratchet type system or something else to reset the stroke length, your 1" fulcrum will not give you very much travel. Once you get to serious power, the time it takes to operate will go up to make it unpractical for lots of cycles. You can't buck physics, you have to supply all the power, so a hydraulic or screw system will give plenty of advantage, but it will be pretty slow. How about thinking more of something wall mounted, but foot operated? Then you can apply quite a bit of force and you won't need to multiply it quite as much.