If I recall, the Flik should have the same can opener as an MP600 and so replacing the part shouldn't be an issue. I would also suggest that maybe you might want to consider replacing it yourself from a donor MP600. They can be found pretty cheap on eBay, and the fix shouldn't be very hard to do.
Otherwise I would send it to Gerber and include a note claiming some sentimental value, and that if they can't repair it, ask that they please return it.
Def