Hi!

If you want to set the keyboard layout system-wide, see
"System Configuration -> Keyboard Layout".

For a user session, you can use your desktop manager tools or setxkbmap.

If you want a shepherd user service, I use this one:

(define setxkbmap
  (make <service>
    #:docstring "Set keymap for X."
    #:provides '(setxkbmap)
    #:start (make-system-constructor
             (string-join '("setxkbmap"
                            "-layout" "us"
                            "-variant" "altgr-intl"
                            "-option" "ctrl:swapcaps,nodeadkeys,nbsp:level3")))
    #:one-shot? #t))

Cheers!

-- 
Pierre Neidhardt
https://ambrevar.xyz/