Instead of bending the plate, why not make it "rattrap" style instead of "quill" style. Ie like Campagnolo track pedals, not road quills. Then all you have to do is cut out the plate.

1 cm higher? What is your leg length difference? My right leg is 1/2" shorter, so I ride with a 1/4" plate between my cleat and the shoe. Felt right immediately and still does four years later. Also got full approval from my PT (who happens to be a very good and strong rider). She said that 1/4", half the difference, is what she would have recommended,

Ben