I have seen the switch. Somewhat same, the only difference is the GW has a button under the mirror adjusting knob. not sure if it will change out. The W Series III has the camera in the mirror as does the GW. The mirror is also heated in both.
I would think the harness is the same to hook up the heaters, camera and on the GW the power for mirrors. So I think the motor and gears would have to be added to the WIII or replace the W mirrors with GW mirrors. Now if the harness is the same that would work great, but still I am sure the computer would have to be programed on the W, if that can be done. I hope to find a solution or just get more exercise getting out and folding.
One think about the Mirror physical size on the GW and W which is the same size, They our BIG, really big. With the design when folder they still stick out a lot. I will measure and report back.
COW, thanks for your input and response.