Last time I made an experiment about booting Puppy using systemd
https://oldforum.puppylinux.com/viewtopic.php?t=117756
Somehow it works but it has many errors upon shutdown process.
When I revisited this experiment. I made a breakthrough. I able to boot a puppy-fied ubuntu distro with extreme minimal changes (but it requires modifications on init script, puppy boot script, and shutdown script). It boots like puppy, works like ubuntu, and shutdown like puppy and even able to make savefile at first shutdown.
I revisit this experiment, because I was thinking of a script that works the same as @wiak 's first ribit but with traditional puppy setup.
I will release the preview iso soon to show the proof of concept.