I'm not really sure how strong the factory cast aluminum carrier would be if it gets whittled down on a lathe. Plus the holes for the adjustment bolts would be a weak point. The Lonestar carriers as well as the other aftermarket carriers are billet pieces so they are quite a bit stronger.
Fwiw, the factory carrier is no longer available from any dealers so they are becoming a rare commodity. You can sell it for $35-50 or even more.