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I was contemplating the very same about a year or so ago. I had the play that you mention on the sprocket along with the metallic clack at each end of the play.
I popped the wheel out to see what the damage was and found that the Coppaslip that I had applied to the pins had dried out and seemed to be working like grinding paste, as I have heard can happen, but never believed until I saw my pins.
I am changing all the Coppaslip for Moly-grease as I go along now, I washed and re-moly-greased the cush drive pins. Putting the carrier back into the bushes, in a randomly different position to before, I noticed that the free play was no longer there. So I tried it in all the possible positions and sure enough, there were tight and loose places. Maybe this indicates some lack of concentricity somewhere, or uneven wear, I don't know.
I simply installed it in the tightest position and have used it since with no worries...I'll probably inspect it during the current ongoing service.
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