Using localectl --no-convert layout ..., I changed the layout of my keyboard. Unfortunately, it turned out that I picked the wrong layout which seems to have virtually no key in common with the actual layout of my keyboard. Hence it seems very difficult to change this, while being booted into my system.
Is there a nice way to recover/change my keyboard layout? (Using the arch iso, I was able to mount my root partition, but I don't know how to log into it or change files without actually booting into it.)
I'm running the current version of Arch Linux on a 2015 Retina Macbook Pro.
edit: It's probably relevant that I do not use any desktop manager. So I boot straight into the tty and from there, if needed, launch my xsession with i3 or xfce.