Just wondering aloud... the most efficient aircraft tend to be relatively slow with a lot of whetted surface area. Gliders need a low min-sink rate in order to catch lift, and they need to be able to fly slowly enough to make safe forced landings as a matter of course.
If you set out to design a small efficient aircraft with class A rather than motorglider stall speeds, sink speeds etc... would it still look like a motorglider?