Am 13.01.19 um 22:36 schrieb Ludovic Courtès:
>> 1) grub
>> 2) linux's initrd
>> 3) console
>> 4) X/wayland's layout
>> 5) How to do the above
> 

Hello, I was working on this recently and made a patch for X11 that
fixes the layout in the slim login and when you login into gnome3 or
whatever desktop environment.

I also made a patch for grub that fixes the layout when you edit the
boot command for a menu entry, but not for the luks prompt. I think that
might require installing a custom grub image (grub-mkimage) with
grub-bios-setup instead of using grub-install (I saw some posts on the
archlinux forum I don't have a link to right now). But this patch should
lay the groundwork for it, as it can generate grub keyboard config files.

The patches are pretty dirty, but I might not have that much time in the
next few weeks to work on this, and since is hot on the mailing list
right now, I'm sending them here now.

Happy hacking!