Congratulations Ben.
I have the 625 PC model with a 4" barrel. It is one of my favorite range guns. A gallon bucket full of loaded moon clips will leave a smile on your face that lasts all day. And since you don't have a slide to operate, you can load them very light or heavy. A wonderful purchase in my opinion.
The S&W Model 940 had such gizmoes. They were not an unqualified success (dirt sensitivity). People seem abundantly happy to use moon clips, even in wheelguns that don't require them (like 357 Magnums) for some perceived or actual refilling advantage. I got funny looks when I spoke of my preference for Auto Rim ammo/brass to feed the 625 with at the time I bought it.A S&W Performance Center engineer could design an optional spring-finger ejector star in an afternoon if they wanted to.