Inconsistency on the choppers bothers me some, but I'll readily admit that I may be a little too particular in that area.
Having said that, a chopper can be way more flexible in sizes, etc. if you are willing to be a little creative.
First off, although they are marked as either LW or RW, I routinely cut both from my LW chopper and can't see where it makes any difference.
Secondly, mine is a 5.5" shield, but I can make about any length shield cut using it fairly easily. I'll put the feather to the "front" of the chopper to cut the height or profile, then move it back to the rear to cut the back profile. I've put some marks on mine so I know where to hold the leading edge of the feather to get the desired length. I've done dozens of 4" shield for my kid's arrows like this.
So, again, with some creativity they can be fairly flexible.
Having said all of that, I mostly use die cuts, and am saving some turkey feathers for the day I finally get a burner.