Right, to be similar efficiency as Globalflyer without improvements to aerodynamics (which is possible), you’d need to restrict flight speeds to roughly Mach 0.

Right, to be similar efficiency as Globalflyer without improvements to aerodynamics (which is possible), you’d need to restrict flight speeds to roughly Mach 0.5 like passenger commercial turboprop aircraft (instead of 0.7-0.8 for commercial jets). A turboprop Dash-8 (although aging) with up to 90 passenger seats (~same as the original 737) is relatively competitive for short haul, so I wouldn’t consider that lower speed to be a showstopper. Dash-8 is, after all, a commercial airliner in common use. But the SCALE of the aircraft is basically irrelevant when discussing fundamental figures of merit like mass-specific energy. In spite of repeating your concern several times, I’m not sure what you think scale has to do with figures of merit that are explicitly scale-less (Wh/kg).