This thread discusses just pulling it off. I feared breaking it also so I masked it off and re-painted it in place.
www.solsticeforum.com

Best way to remove: COVER. Parking Brake Apply Lever
My "COVER. Parking Brake Apply Lever" was scratched so I got a new one. I had expected to be able to simply pull it off, but no-go. Does any one know the best / easiest way to remove the old one ? 2007 Pontiac Solstice Base Convertible PARKING BRAKE SYSTEM