What Joe said.
Singer did make a motor that used the treadle linked to a controller and motor, but that was probably well over 80 years ago. I have a 27 that they drilled holes into the back of the pillar for the motor mount and it is a pain to attach and adjust.
There was someone on another forum that put a motor in a box behind a Davis that did not have a motor boss. So it can be done.
Janey - Neat people never make the exciting discoveries I do.