Good write up.

I did not see the pry-out notch for the lower ball joints. I beat them out with a hammer from the bottom, which destroys them if you ever want to use them again.

I got stainless zerks from McMaster-Carr. I had Advance zerks on my old ball joints. I found that you have to be extremely careful to put the zerk in straight if you do it with the joint on the truck. It's very hard to line up and the ball joint steel is soft. You can use some sealer like avation form-a-gasket, the brown tar stuff. It's a tapered thread so it will get tighter as it goes in further. It's also possible to pull the threads out of the ball joint if you overtighten the zerk.

A screw extractor should get the zerk out of your old BJ.