XKB Keyboard Layout for US(€) keyboard with the Danish letters øæåØÆÅ & ß
- Patch /usr/share/X11/xkb/symbols/dk with dk.patch
- Patch /usr/share/X11/xkb/rules/evdev.xml with evdev.xml.patch
sudo patch /usr/share/X11/xkb/symbols/dk < dk.patch
sudo patch /usr/share/X11/xkb/rules/evdev.xml < evdev.xml.patch
You now have a keyboar called "Danish (US keyboard with Danish letters)"
You may need to run
sudo dpkg-reconfigure xkb-data
For the changes to take effect
Download Microsoft Keyboard Layout Creator (MSKLC)
Load, compile, and install "us_dk.klc"