I believe hyprland has a shader that will do CRT emulation for the entire drawing surface:
https://github.com/DemonKingSwarn/retro-hyprland
I haven’t used it and have no idea if it works. Now that my eyes are shot I don’t mind losing fidelity for a bit of atmospherics when doing some casual computing (eg checking email with Pine like it’s 1999.)
If I weren’t so lovingly tied to niri I would like to give this shader a go. Nostalgia is one hell of a drug.
It doesn't quite seem to have the same effects, though. It would be nice to see cool-retro-term's extreme CRT effects implemented in an all-points-addressable low-res mode. Perhaps it could even be made to run as a Wayland compositor, similar to hyprland.