Norwegian characters on US keyboard layout with Caps Lock as modifier key (.Xmodmap). See comments for usage instructions.

.Xmodmap

clear lock
!Maps Caps-Lock as Level3 Shift
keycode 66 = Mode_switch ISO_Level3_Shift
!Norwegian alpha chars ÆØÅ 
keycode 47 = semicolon colon oslash Oslash
keycode 48 = apostrophe quotedbl ae AE
keycode 34 = bracketleft braceleft aring Aring

README.md

Usage

Place the .Xmodmap in your home directory, then run xmodmap ~/.Xmodmap to test the configuration. For a persistent setup, load the file inside ~/.xinitrc:

usermodmap=$HOME/.Xmodmap

if [ -f "$usermodmap" ]; then
    xmodmap "$usermodmap"
fi

Bindings

• Caps-Lock + \ = æ
• Caps-Lock + ; = ø
• Caps-Lock + [ = å
• Caps-Lock + Shift + ; = Æ
• Caps-Lock + Shift + ; = Ø
• Caps-Lock + Shift + [ = Å