I keep on thinking about rear wiper motors, and the Aygo one is interesting, thanks.
I suppose the main thing to work out will be the angle of the screen. Rear screens tend to be nearer to vertical, whereas front screens are more angled.
I can't picture an Aygo/C1/C1 screen without a bit of Google research, but it will definitely be worth looking at. I'm planning to get a new wiring loom made up soon, so I need to get all the electrical components finalised beforehand.