That's a good practice to change springs and discs.
Yes, there are no slippers commercially available for the CB's. Just good old fashioned, rev-matching and clutch-feathering. I am sure that Brent could give tutorials on his "best practices" as he must have a mastery of it with his vintage racing.
I have not yet owned a modern bike with a slipper clutch, and gotten by on my best efforts and practice at the track, where it really matters. Most of us, I suspect are not putting as much demand/doling out punishment on our drivetrains as racers.