So it looks like the extension angle change is a must. Just looked at JBA site they have some of the UACs on sale $395.00. Couldn't find the XK one through my I phone may call them and ask price. Searched the moog ball joint , Summit has them for $25.00. Changing the JBA joint looks to be easy.
Also for info I use a two jaw puller to pop the ball joint loose from the steering knuckle instead of using a fork which usually tears up the boot. I used this when doing the teardown to install the lift and did not damage them for the reinstall.