Any chance the mount point at the swaybar could be moved ~6-8mm toward the rear of the car without much trouble? If so, the bolt could be swapped for a threaded rod and a nut for the swaybar mount (the thickness of which would determine how far back from current this would be mounted,0 and a second nut for the diffuser, making this one heck of a lot easier to take on/off the car.
Why would you do that? I would because it's not legal when I AutoX