If on stock, use FinQwerty by @Anssi Hannula you can find it in the normal android market.
to handle 1 and 7.
(It really is not a running app as such, but presents the right configuration files for the wanted layouts to system on boot, so we an choose them side be side with the normal ones)
PS Dansk og norsk layout er 99.9% identisk, Æ <-> Ø.