You’re not going to need that ball joint press kit for this job. The ball joint is serviced as a complete control arm. You have to lower the rear subframe to get the arm out. It’s a pain to do, but not overly difficult.
However, can the ball joints be pressed out without lowering the entire subframe and removing/replacing the entire control arm? I already bought the ball joints and I don’t see a reason why they can’t be.