"NOTE: if you use a non-US keyboard and need to enter a passphrase during boot, this may be problematic if the keyboard mapping is US while Slackware runs from the initrd filesystem. In this case, add support for your keyboard to the initrd image using this additional parameter to the 'mkinitrd' command above: "-l <language>". The string <language> is the same as the one you select in the installer when your keyboard is non-US. Example for a dutch keyboard: "-l nl"."
Now I'm warned that other systems that use automated kernel updates may clobber the keyboard choice for the initrd.
I ended up plugging the harddrive into another computer and fixing it from there.
I never got that shit from slackware...
In fact, Slackware don't do anything unless it's told, which is not as bad a thing as it may seem.
Alt + 134 = å
I tend to prefer extremely long passwords/phrases over things that require stupid characters (had trouble with WiFi keys using the French "é" back in 2008, all my passwords are ASCII since)
Although I have to agree with him I wouldn't use it in a Wifi password either.
[1] apologies, it appears to be the last pedantic Wednesday before Christmas
The solution for me was to stick on LTS distros.