On Fri, Jan 10, 2020 at 03:50:45PM +0300, Alexei Drozdov wrote:

> Manual proposes to do it at runtime:

From my config.scm:

  (services (cons* (service slim-service-type
                     (slim-configuration
                       (xorg-configuration
                         (xorg-configuration
                           (keyboard-layout
                             (keyboard-layout "pl,cz"
                                              "legacy,ucw"
                                              #:options '("compose:menu,grp:caps_switch")))))))
                   ;; other stuff
                   ))

But it works only in xorg. May be of use for you if you don’t mean the
text-mode console.

WŻ