I have a calf injury that requires me to place the middle of my foot on the pedal rather than the ball of my foot. With the clipless pedals/shoes I own, I've moved the cleat as far aft as possible, but it's still too far forward. Anyone know of a solution for setting the cleat further aft on a shoe -- either a special or custom shoe or a special cleat system that's adjustable beyond the norm?

Many thanks, Tom.