Used door will be your best bet in my opinion, if you are at all handy. I am not sure of the Leaf, but it might be as simple as removing the interior panel, then popping off the outer door skin and replacing it with a skin from a donor door. unless your door frame itself is damaged also. (you said PDR will get you to 90% so i assume door skin is the only damage (cosmetic)). with newer VW/Audi the outer skin comes off, haven't dug into my Leaf that much yet. Quick look in the FSM says you gotta replace the door as a whole though.
The plugs come off inside the door from the window switch and speaker and then you can pull them off with the rubber grommet through the door. Definitely a job you can do in your driveway.
i am quite sure the paint code on 2015 is still the same as 2013. to confirm, check with dr colorchip website to see touchup paint part number for the two cars. i know with white they don't match through the years (that's what my car is..)
2013 Leaf SL Premium
27k, 93% SoH 2/17 32k, 96% SoH 6/17
46k, 94% SoH 2/18 52k, 88% SoH 6/18