you misunderstood - i tie the keyboard settings for lxqt to the choosen language, because the real lxqt config for keyboards is not complete. it looks like that:
17 case $LANG in
18 de_DE.utf8)
19 sed -i "s/model=.*/model=${XKBMODEL}/" /etc/skel/.config/qxkb.cfg;
20 sed -i 's/layout=.*/layout="de,us"/' /etc/skel/.config/qxkb.cfg;
21 sed -i 's/variant=.*/variant="nodeadkeys,,,"/' /etc/skel/.config/qxkb.cfg;
22 ;;
23 en_US.utf8)
24 sed -i "s/model=.*/model=${XKBMODEL}/" /etc/skel/.config/qxkb.cfg;
25 sed -i 's/layout=.*/layout="us,de"/' /etc/skel/.config/qxkb.cfg;
26 sed -i 's/variant=.*/variant=",nodeadkeys,,"/' /etc/skel/.config/qxkb.cfg;
27 ;;
28 *)
29 QXLANG=${LANG:0:2}
30 sed -i "s/model=.*/model=${XKBMODEL}/" /etc/skel/.config/qxkb.cfg;
31 sed -i "s/layout=.*/layout=\"${QXLANG},us,de\"/" /etc/skel/.config/qxkb.cfg;
32 sed -i 's/variant=.*/variant=",nodeadkeys,,"/' /etc/skel/.config/qxkb.cfg;
33 ;;
34 esac
So i think your usecase is not implemented yet.