Reading through it I wondered if there was such a thing as a Lightning extension cord, which would allow more separation. But at that point, with iPhone, DxO, and possible battery pack held by two hands, even the Sigma Quattro looks like a design miracle by comparison.
If DxO want to make cameras, great and welcome. But it's a tough market and gilding a lily is not a great way to start. Maybe make a lightning-connected folding touchscreen, or a bluetooth module and a little clip-on wireless screen for spectacles. Removable so the wearer doesn't suffer the fate of Google Glass wearers.