Exactly what I have.
For the cost of all the electronics and especially if you have to pay for the labor also, just diff lock and regear the front and rear and call it done!
Yeah, you'll have to wheel it old school with just the right modulation with brake and throttle, and won't have a fancy computer helping you out.
That's really all MTS and CC is for, to replace lockers and make it easy for anyone to get in over their head.
I can understand Toyota/Lexus rational: it's a lot cheaper to get come programmers and electrical engineers to make a MTS and CC package in the front end of the model (GX460) before release, than have to spend all the money throughout the life of the model adding lockers and switches as a costumer option, which many would probably not want. After all, it's cheaper to just add some wire and programing verses physical lockers and still have to add all the wiring and even some programming.
Truth be told... I did add MTS, and plan on adding CC even with my lockers and all. I just kind of like having ALL the bells and whistles.