[EricH]

I'd suggest that if you err, you want to err on the side of caution. If you choose to go the non-caution route, develop a backup plan that can be installed in an hour or two at competition; the inspectors are likely to figure that illegal materials connected to legal materials are still illegal.

You could also try to get the magnets off... but there are some things that may just be really really unsafe/not smart/impractical. What's the mount like, other than really secure?