I think you are correct in pointing out the design fault of Jeep (fault or genius?) that the whole arm needs to be replaced....
A couple of us have ordered the replacement upper control arms from Jeeping By Al in the states. He has fixed this issue with an aftermarket UCA that has a replacement ball joint.
Do a forum search, but it isn't too difficult to install these yourself. Just need a few extension bars and an 18mm socket.
I think I paid around AUD400 for both delivered about a year ago.
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2003 Black KJ Limited
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