Been following your journey into CAS shooting, Charley. You seem to be historically minded and desirous of being authentic.
If you are going for authenticity, keep in mind the Alchimistra is one of those "guns-that-never-was". Likewise, short-stroked firearms of any type are modern affectations by people in this sport who think it can make them a better shooter when competing.
Although as always, it's your game, so go with what you have an itch for. God knows as you and your wallet get sucked further into this sport, you'll be acquiring lots of toys.
RCJ