Believe me, you don't want a self-centering 4jaw. The independent 4jaw is both more flexible and more accurate.
Centering work in the 4jaw can be made much less tedious with a few homemade tools and a straightforward procedure. You may want to read my procedure here...
Centering work in the four jaw chuck
With this procedure, another dead simple addition can make centering polygonal stock much easier...
Centering aid for polygonal stock

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