You can try soaking it in milk, which works for salted herring. You can boil it and drain the water.
Normally very salty seafoods (like caviar) go great with deviled eggs or on butter (unsalted).
You can use a blender to blend some of the smoked fish with the neutral unsalted base to make a spread or dip for your crudites (i.e cream, butter, sour cream, home made mayo)
You can crumble it in various salads or make a tomato based sauce using it to taste. Just use a recipe that calls for ground beef for something like carbonara sauce or find a recipe for a seafood one. Same goes for soups. Obviously, omit all salt from the recipes!