These are my xkb configs that I believe might be useful to other people
Among layouts that are not avalible in standard xkb it has Diktor, Rulemak (it is in standard xkb but is missing from some evdev.xml configs that are on part of the OS) and powerful Extend layers for them (and Colemak).
You can install these configurations with the following command:
TMP_DIR=$(mktemp -d) && sudo rm -rf /usr/share/X11/xkb && git clone https://github.com/carbon-starlight/xkb-configurations.git $TMP_DIR && sudo mv $TMP_DIR/xkb /usr/share/X11/ && rm -rf $TMP_DIR
This line will overwrite the whole xkb cataloge (unless you installed 3-rd party keyboard layouts it shouldn't contain any personal configurations). This installation doesn't touch anything but the usr/share/X11/xkb catalouge (folder). If something goes wrong, just replace this catalouge with the default one for your distribution.