Seems like drop bars could hook over the wheels, if the stem were designed for it.
I had a Dahon folder. The bike just never fit right. The saddle to bar reach was too short, the bars were too high, and the bars were flat straight bars which are the most tiring design for longer rides. It was a bike made for short, slow rides in the sit-up-and-beg position. I've looked for a folder that fits and rides like a roadbike - fast, stretched-out, low and aero body position. The Bike Friday looks very good, but it doesnt fold very compactly. This Helix might, I think, be modified to work.