From what I've heard, and my experience working on these things, the swap would not be a "picnic" unless you had a doner vehicle sitting right next to it. You're right, wiring harnesses, PCM/TCM, exhaust, and a bunch of other stuff needs to be swapped. If you're really serious on this though, you may want to call Cleveland Pick-A-Part http://www.clevelandpickapart.com/
and chat with them. They have done and will do for you almost any DCX swap you want....for a price of course. I don't bellieve the it is as outrageous as you might think either, considering the labor involved. Good luck on whatever direction you choose.
06 GCO, Dk Khaki, QDII, Flshing Hi 3rd Bk Lt, MDS "ON" Lt, Airtab Vortex Gens, Debadged, Fumoto Drain Valve, BT Catch Can, Chopped EGR Tube, SRT8 CAI, K&N Filter, Sonnax Trans Line Press Booster, SC Tuner W/Adv Trans Tune App, DS Tuner, Cust tubular hdrs w/3 in Magnaflow/Xlerator AP Exh Sys, Bilsteins, SRT Springs/Sways, Cust Eng Cvr, SRT8 frt/rear bumpers, FRI Sidewinder Cam/6.1 valvetrain, SLP 25% UD Pulley, BBK true 90mm T-Body, SOS Ign Coils w/.060 spark plug gaps, SRT Reps with 265/45&295/40X20's.