I have stumbled upon a concept drawing of a KZ aircraft not mentioned elsewhere. The 3-view was drawn on the cover of a booklet with a list of KZ part-numbers.
The plane was named ‘KZ-Reklame’ and was drawn in 1950. The wing was to have a ‘scrolling light’, similar to that on the ‘Politiken’ building in the center of Copenhagen, on the underside of the wing. As can be seen from the 3-view, the wing is flat-bottomed and the engine nacelles were cut back, to leave the wing bottom free.
The Politiken newspaper sponsored many aviation events during that period, and I believe this concept plane was meant for this newspaper.