Systemd+Wayland+GNOME: Change GDM keyboard layout

[strm]

Hello everyone, I've got a little problem with GDM.

The password prompt uses us keyboard layout and there does not seem to be a way to change this. I already spent hours searching the web and trying every trick in the book (i. e. that I could find). Nothing worked so far. No .xinitrc, no localectl thing, no XKBLAYOUT in /etc/vconsole.conf etc.

Is there a way that works with Gentoo or do I need to chose another display manager?

Help is appreciated.

Gentoo 6.6.62-dist, GNOME 45.2 (although Settings says it is 46), Wayland 1.23.1, systemd-256.7

[mega_flow]

localectl set-x11-keymap is the command u looking for
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default/linux/amd64/23.0/no-multilib/systemd gnome:47.2
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