I have a buddy that just got his DeLorean and is doing a 15" stock rear wheel on the front. He wants to run 225 45 15 on the front and 235/50ZR15 on the rear. He is working now to make this happen and with lowered suspension it will no doubt look awesome.
Apparently he has a few obstacles to overcome but he is pretty confident about it. I have only seen one other D with a 15" factory wheel mounted up front but it wasn't anywhere near a 225 45 series tire on it.