Hi, Wow! This kmonad tutorial is the first time I see generic examples 'for Linux' that are silently Nix-specific, rather than, say, Debian. Ehm... 'progress'...? :-/
Guix System happens to use /run/current-system too, but does not aim to be Nix-compatible. The Guix System equivalent would be /run/current-system/profile/bin/sleep (I don't know if you're running Guix System or whether 'pack' is just short for package, not 'guix pack'.) However: if PATH is set correctly and kmonad supports it, I strongly recommend just writing sleep 1 && setxkbmap ... instead. Otherwise, your configuration will work only on Guix System *and* only if you install setxkbmap system-wide, not with 'guix install. Kind regards, T G-R Sent on the go. Excuse or enjoy my brevity.