I like KDE (definitely better than Gnome), but their Wayland migration in KDE6 removed features that could still be implemented. e.g. I get why they don't want custom lockscreen programs now, but running custom scripts on lock/unlock was removed. That's rather unfortunate.

Yeah I'm still on X11 and I use this to set the screen sleep to 10 seconds. And back to never sleep when I unlock it again.