The Eagle CAD vacuum motor is different from Jeep versions, so the Posi-Lock for Jeep applications won't work as a direct bolt-in to an Eagle, but I imagine an Eagle disconnect housing could be modified to accept a cable similar to the one used in the Posi-Lock setup. San Antonio Brake & Clutch can make power control cables, so I know there are other places around the country that can make you a cable similar to the Posi-Lock of you are willing to butcher up one of the Eagle disco shifters.
The Warn/Mile-Marker/Ranger-style D30 5-on-4.5 lug pattern hub conversion available for the XJ/YJ/TJ/ZJ D30 comes with a pair of new outer stub shafts designed to work with manual locking hubs, which have a center selector which you must manually turn to engage the axleshaft to the wheel hub to allow it to transmit power(or disengage to freewheel). You DON'T simply bolt on the hubs - that's why the hub conversions aren't cheap - they come(came, back in 2002) with new outer shafts(which connect to the inner shaft via the cardan-cross-type universal joint), new bearings, new hubs for the bearings, and the lockouts. You also have to have the center hole in the rotors turned to a larger diameter to fit over the hubs, or at least I recall the Warn the conversion I did on my YJ back in 2002 had to have that done. Different outer stub shafts means there is NO WAY a hub conversion could be used for our Eagle's application, since we don't have cardan-joint front axle shafts. Custom built half shafts with the right type of outer retention, then sure, locking hubs could be done.
If you're going through that much trouble trying to get manual-locking hubs or a CAD actuator that works by cable, then you miche as well just do an XJ solid axle swap (non-CAD) and get an off-the-shelf locking hub conversion . . heck, throw in an ARB locker and upgraded inner shafts.