if you feel like looking for it, the vacuum disconnect front axle is a good choice for this.
control the vac disco with the selec-trac vac switch from an 84-86 selec-trac equipped XJ (the switch goes into the center console where the little coin tray is, between the shifter and the e-brake handle)
when you flick the switch off it disconnects the passenger side axle and you have "three wheel drive" the steering will pull a little, but this aided tremendously in situations where you'd end up sliding around.
I did this in my 85 XJ, and I wish I woulda kept that axle and the switch to swap into my 89. I really miss that "poor man's selectable locker"
it really wasn't all that bad to turn it when in 4wd. but you need to have the right backspacing on your wheels to pull it off (draw an imaginary line through the balljoints to the ground. if the line points to the center of the tire's contact patch, or slightly outboard of the center, it won't be quite as bad) you can mimic the effect it will have on your steering by stopping on dry pavement, holding down the brakes with a good amount of pressure and then try steering.
any auto locker will cause the off-camber sliding to a degree (they lock when torque is applied)