the roof rack is a problem because the side curtain airbags are located right below the mounting points. Not being an explosives expert I'm not going to risk my life taking the rack off.
Ok. I would have the same trepidation. If you disconnect the battery, you could disable the mechanism, but I would be worried about putting it back together correctly, i.e. exploding after battery connecting.
I was toying with the following idea if I had a Pontiac Vibe with sidebars like yours :
It could be a removable kamm-back. It would start at the beginning of the sidebars because it would be designed to mask the sidebars from the air-stream. Sooooo, there would be a large horizontal sheet/roof component also starting at the beginning of the sidebars. The purpose of the "sunroof wind deflector" would be to insure that wind/air doesn't get under the horizontal sheet of the kamm-back at speed and turn it into a sail :