1st of all, I like to read you have still good thoughts for high speed edf!
For high speed, I doubt that a twin would be the ticket because of additional weight of anextra drive train. On the other hand, you could reduce thrust tube dia to gain efflux.
Perhaps you could redesign the A10 for high speed. At VTH you can order the Heino dittmar drawings for sp400. There would be good space in the fuse for cells. For simplicity you could make a straight wing. even a clipped wing Reno style wouldlook nice.
nacelles positioned like on my Jetmach60 will have minimal wiring:
I even converted a sig King Kobra "Hammerhead shark" style.
If you really like simplicity you need to build a turbine Cri-cri. It took me 4 years to fine a decent 3-view to work with but never found a good route to pull the canopy.