The only way I can think of, is buying another usb cigarette charger and strip out the insides to expose the 12v positive wire and the ground wire(keep all of the electronics in there as u will need them, you can box them and tape them up and hide behind ashtray or wherever u like). Take these wires from existing cigarette feed but split them to feed both cigarette lighter and your new charger cable. This will keep them on the same fuse(your phone will draw very little current anyway). Use a usb to lightning cable and feed this through to expose only the lightning end to where you are installing your phone.
Keeps it clean.
Alternatively by a 4 cigarette adapter and screw it into the carpet to hold it in place(in a footwell out of the way) and run your necessary cables behind the cockpit trim.
The Difference between Genius and insanity??............. Is the measure of success!