Comment by FragenAntworten

I wanted this exact thing (Caps Lock -> End), and https://github.com/rvaiya/keyd works.

It runs in the background as a systemd service, and the config is just:

    $ cat /etc/keyd/default.conf
    [ids]
    
    *
    
    [main]
    
    capslock = end

(I got excited that someone else likes the same keybinding I do and wanted to share, and only then saw "not an invitation for fixes". Well, maybe it'll help someone else.)