Berry, maybe you could swing a deal with your builder to "loan" you a standard speedster glass windshield long enough to get the car approved. Then you could switch to the the plexi windshield. I have heard that at least one manufacturer's windshield is directly bolt-for-bolt interchangeable with the speedster glass windshield.
After the switch, remove the wiper or the fuse (per Harry). Of coarse I would never suggest this if you have issues with local laws. ;)