I have an already existing circuit between the mains wall supply and a window shutter (see image), it has a gewiss rocker switch for opening and closing the shutter when you press and hold one of the two-buttons. I want to add another switch that will be operated remotely/automatically. I plan to add this using the pink wiring on the diagram below.
My question is: is this a legitimate circuit? In terms of, what happens if both switches are closed at the same time #1 for alternate directions, and #2 for the same direction (say UP)? Or any other faults you can see?