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According to the [keyboard layout wiki](https://wiki.archlinux.org/title/Linux_console/Keyboard_configuration), keyboard configurations (for both the console and Xorg) can be conveniently set using the `localectl` command.

In order to set a second keyboard layout, we have to dig into the [manual page](https://man.archlinux.org/man/localectl.1).
There it is stated that a second layout (for the console) can be set up by specifying a _"toggle keymap"_.
Concretely, you can set a second keyboard layout for your console:
```
localectl set-keymap KEYMAP1 KEYMAP2
```
This will also set `KEYMAP1` as the Xorg layout.

If you only need multiple keyboard layouts in your GUI, it should suffice to set the Xorg keymap using a comma-separated list of layouts using
```
localectl set-x11-keymap KEYMAP1,KEYMAP2
```
Additional arguments can be used to specify models and/or variants.
See the [xorg keyboard wiki](https://wiki.archlinux.org/title/Xorg/Keyboard_configuration) for further details.
This will also set `KEYMAP1` as the console layout.

Note that if you want to have both, you will have to use both `localectl` commands and specify `--no-convert` for the second command.
Otherwise, the settings from the first command will be overwritten.