Just installed xscreensaver and it works more or less. i don't think it can screenlock but haven't tested everything. Just popped up a terminal and ran xscreensaver-settings and it asked if I wanted to run the server. Picked a few savers off the list changed the times and waited. Only working on one desktop but that doesn't bother me. A little buggy, hard to get it to stop with a mouse wiggle or keypress. Have to switch desktops and kill the pid. Better than it was a year ago though. Might work better in kde than in hyprland?

Using Arch, wayland, xorg-wayland