Try replacing hte GM column with the ChryCo pre-airbag column (will probably fit) and change the locks to the ChryCo locks, and have them all "keyed alike," and you should be golden.
Myself, I prefer keeping the GM-style keying, but I'm used to it. My main problem is with three XJ's and three sets of keys - one of these days I'm going to re-key everything so they're all on the same pair of keys, and some of my headaches will go away. God bless custom dog tags - best key markers I've ever found!
5-90
BTW - 2D/4D doesn't matter, since the rear doors don't have keyed locks...