some manufactures already do (see for instance the sideways lambo). Slot.it as well.
However, having rules that state that part should be sympathetic of the original look of the car is the way to go.
I race digital and I know what it means to break wings or lose mirrors. But we are allowed to build our own in rubber for instance.
Having a rule that disqualify a car because does not have the original wiper seems a bit excessive to me, especially if you are racing a class where the makers does not support spare parts.