Easiest way for you to do it vaughn would be to swap the entire hubs over to mk3 5x100 ones. Two adapter plates will make you eat wheel bearings like they are potatoes, and could in worst case cause the wheel nuts to shear and you to loose a wheel when driving. Also would make the offset something stupid like 6 at the lowest and -15 at highest, so arch clearance would then be a major concern.
Unfortunately much the same problem as i had on my old split rims, couldn't get 4x100 -> 5x112, too much overlap on the holes.
