I could see a neat little diorama of a German C.30A in camouflage alongside a Panzer I or II either in France or perhaps North Africa being used in an Army Cooperation role. Maybe even do an Air Ambulance version with carriers on either side for a patient.
The French giros saw limited use after the invasion because the type was not suited to a mobile war -
too slow, too vulnerable, the German's wouldn't have faired ant better. As to side panniers, really a
no go for several reasons, the biggest being the drag on the underpowered airframe and handling
problems caused by the panniers. Which wouldn't be good on what was actually a fairly twitchy design.
A single AVRO Rota built C.30 was fitted with floats and it was a disaster, for the reasons stated above,
and, no, simply increasing engine power isn't a solution with the type, nor is increasing size as all of the
larger giros built in period were abject failures, most not being able to leave the ground and suffering
from major ground resonance issues.