I followed one of the links above and I successfully paired the device with the keyboard, disabled the virtual keyboard and it now works. I can access numbers by pressing Alt-gr. However I can't access the right shift key, the '<', '>' and ' symbols.
cp -i /usr/share/X11/xkb-chinook/geometry/pc /usr/share/X11/xkb/geometry/.
setxkbmap -device 4 -I -I/usr/share/X11/xkb-chinook -rules base -model nokiasu8w -layout dk