zsysctl-manual-gc
Manual zsys garbage collection script. It sorts snapshots by Kernel version, and removes the oldest first up to the amount you specify.
Right now it's interactive, if I'm feeling less lazy I might make it so you can pass CLI variables to it.
Unless anyone else wants to tackle that.
Cheers!
DISCLAIMER: User at your own risk, I accept no responsibility or liability whatsoever. You have been warned.