Dunno about linux, but on the ships I work on there is some mix and match of Norwegian and english keyboards. No problem swapping the keyboard layout in windows BUT a few of symbols are then in a different location, mostly around the right shift key but I'll asume your keyboard is marked with something other than a '£' symbol on the '3'.
Maybe not a problem for you if you are a touch typist, but I usually end up having to stab several keys before I get the right symbol.