Just use small pistol primers. From what I've read there won't be much if any difference between the two because of the size of the flash hole. Personally if it wasn't many pieces I'd recycle them or sell them. They're a pain in the butt to separate after a day of shooting and I haven't been happy with accuracy compared to a large primer.
As I understand it, these rounds were only developed to be EPA compliant in indoor shooting ranges because most of the gasses they are concerned about come from the primers. There's quite a bit of info on this in some of the other 1911 forums.