Hinged refrigerator vent grill?

Dometic fridge lower vent. Just curious if any one has converted Dometic lower vent cover to hinged. Other than inconvenient twist pin fasteners, setting on the ground to do anything, ours either the frame has expanded or the cover shrank. Top that clips in just barley catches so resorted to drilling and using a screw to ensure it doesn't fall out on the road.

Easiest would be surface mount a piano hinge top, painted shouldn't look to hokey. Thinking maybe someone came up with better idea. Possible trim cover flange so back is flat for cabinet type hinge?
Probably change the twist pins for non keyed baggage closures.