Oh, I didn't know the firmware for the lens was on a different subsystem. Do you know if this is a different chip, or if it is on the same die with the main CPU?
I remember that long time ago (around 2010 or so) I took a lens from a non Canon Camera and placed it on a Canon camera and it sort of work (meaning, it moved in and out, but I didn't take any pictures, since it was just hanging off the main board).
So it could be that there is some generic, non Canon chip that handles all the P&S camera lenses, in which case getting the documentation for it could be very helpful.