You can disable speed on the speedpuck. Still not allowed?
Depends on if you think the "I didn't have it enabled" argument will hold up in a hearing. If you think it's solid then you can use your disabled GPS device, if you don't think the argument will hold up in the room then you'll be leaving it on the beach. Of course your results may vary depending on who is hearing the protest. If you get a hard butt like me you'll get flicked.