OK, we have progress!
Anthony and I managed to arrange time off at the same time. The axle is installed but there are still a few things left to do. We still need to have the shafts shortened, and install the JK knuckles, hubs, and brakes. We ran into a few snags and decided to put the WJ knuckles, brakes, and TJ hubs on the JK axle to get it back on the road while we nail down the rest of the parts.
I want to retract everything I've ever said about WJ brakes fitting on a JK. I was completely wrong. Furthermore, WJ knuckles will in fact bolt up to a JK axle, but the camber is not correct. The steering is also not the same between the WJ and JK knuckles. It is similar, but when the knuckles are next to each other it is easy to see the difference.
JK knuckle on the left, WJ on right. You can also see why the brakes won't work. The rotors are different as well. Different rotor thickness and hat height. You can't see it in this picture, but the JK knuckle has a lot more meat in the tie rod area that makes it nice for drilling or reaming them out for larger parts.
We set the steering up and mocked up the track bar with the JK knuckles on the JK axle. We were able to extend the track bar to within 1/2" of the length of the drag link, so bump steer should be less of an issue, even though it wasn't really bad before.
These pics are at full bump.