I think a variety of indexers may be found historically -- on eBay and sometimes accompanying Stars for sale -- but to the best of my knowledge, only the Moon Unit is offered presently. As a newer Star owner, that's why I went with the Moon Unit indexer. It has worked superbly since I lightly sanded the bronze guide bar; initially, it wasn't reliably returning to its starting position under its own spring tension.
I believe that the seller of the Moon Unit, Ray Brandes, is also a forum member here. He offers companion product, the Case Kicker, as well for your "ejection" needs. It too works great. Check out his YouTube videos for more details.
With these two add-ons, my Star is a joy to use. After years of loading single-stage on a T7, I now spend as much -- or more -- time performing quality control inspections as I do actually loading the rounds.
-Kirk