Well...I guess I can't say it without a slight bit of uncertainty as I haven't actually tried to do it. But I've compared the pedal boxes from both and haven't been able to find any difference between them. For that matter, as I mentioned before the pedals are on a common shaft for the soft dash RRC/DI, and the single pedal for the automatic is the same way, it's on a long shaft which goes all the way across so it should be simple enough to unbolt the shaft and slide it out, remove the single brake pedal and install the brake and clutch pedals from a DI, then drill the hole for the clutch master cylinder. I don't know if there's room under the dash to do this in place, but I plan on giving it a shot when I find a '95 that I want to keep and convert it to 5-speed.
1991 RRC 4.2, R380, LT230, TrueTrac, Detroit, sliders, 33s, blahblahblah....
1994 RRC LWB
1994 RRC SWB
1995 RRC LWB 25th Anniversary Edition
1995 D90 project