custom.customKeyboardLayouts.compose_tlde = {
    desc = "Compose is TLDE";
    src = builtins.toFile "compose_tlde" ''
      default partial modifier_keys
      xkb_symbols "tlde" {
        key <TLDE> { type[Group1]="TWO_LEVEL", [ Multi_key, Multi_key ] };
      };
    '';
  };

  services.xserver.xkbOptions = "ctrl:nocaps,grp:shifts_toggle,level3:ralt_switch,compose_tlde";