A RD isn't indexed which means the only limits to its movements are the limit screws. What governs how much it moves per click is the shifter, which is where I would imagine you will have difficulties as generally campag & shimano are differently spaced, aside from 11 speed.
As it's single ring front based so should be OK just with rear. I am trying to read and see but seems like Shimano VS Campy cassette spacings are totally different.
It would be good to source Campy original flat bar shifters but I guess it will take ages.
A RD isn't indexed which means the only limits to its movements are the limit screws. What governs how much it moves per click is the shifter, which is where I would imagine you will have difficulties as generally campag & shimano are differently spaced, aside from 11 speed.
For the front you could use whatever you wanted.