Hello Arthur!
The Hilfskreuzer (or armed merchant ship or raider) "Wolf" was the only cruiser of this type with an aircraft.
Why? An aircraft simply needed very much space on an heavily armed merchant ship (up to 6 guns, amunition, up to 200 (or more) seamen, up to 200 prisoners, a lot of food, on some occasions mines, loads of camouflage material and as much coal as possible). Additionally the aircraft had to be hidden inside the ship instead of showing it on deck. It was an experiment with some success.
Maybe the Junkers all-metal CLS.I would have been a good aircraft for such a task because it was easy to put away the wings. But in summer 1918 there were no more Hilfskreuzer.
Hope this helps!