Hope i’m not too late for my 2 cents. So this is what I would attempt. Cut 3 or 4” out of the pedal stem 2” below the pad. Slide a pipe over the pedal side stem and weld it solid. The pipe should be some where around 6” long. Drill 1/4” holes in the pipe at 1” spaceings. Now also drill one set of holes in the lower pedal stem. Slide your new adjustable pedal system together and insert either a bolt or a roll pin. The pipe will need to have a slight curve in it to match the pedal stem. Have fun.
