Why can't Victorinox add the option at checkout to fit any 91mm knife with the plus scales? It would mean more business for them, it would save the customers money, time, and effort (instead of buying the plus scales and pen/pin separately), and it would mean less discarded plastic (original scales), which is better for the environment.
I personally fit all my favorite models with plus scales in all colors I can find, but most sane people don't. 😜