A. One can make the shelf a close fit between the cabinet ends and
make shallow dados in the shelf ends to fit around the clip.

This would be fairly easy to jig up, good idea.


B. Use a screw through the bottom hole of the clip into the
shelf...that's why it is there.

C. Put a face frame on the cabinet so it retains the shelves.

These solutions make it harder to move the shelves around.