I couldn’t let go the combination of the Honda City and the Motocompo, so I did some searching upon the topic of foldable motorized bikes and found this:
Motocompo successor: the Honda e-dax
The Motocompo successor: the Honda e-DAX

The e-DAX was a prototype shown at the Tokyo Motor Show 2001 as a foldable bike for the Honda Bulldog prototype. What a coincidence that the Honda City Turbo II was nicknamed the Bulldog (it really looked like one!) and the Motocompo’s bigger brother was called the Dax in Europe.

Honda Bulldog and E-dax on Tokyo Motor Show 2001
Honda Bulldog and e-DAX on Tokyo Motor Show 2001

The e-DAX only weighted 25kg and could easily be folded into a compact package. The e-DAX has unfolded the same dimensions as the Motocompo but was rougly twice as small when folded. Also the weight was only half of the Motocompo. I really wonder why Honda never actually tried to sell the e-DAX…

If you want to know more about the e-DAX or the Bulldog:
[Honda World e-DAX exhibition]
[e-DAX on Tokyo Motor Show 2001]