In which case scrap the RBS.15s off of it and relocate from there. You've always got land based AShMs as well as Air based ones that will operate in the littorals.
I'm in disagreement with this. AShMs are one of the key points of keeping a boat like this.
EDIT: However, placing the launchers on the sponsoons isn't a bad idea either. Actually, it's a brilliant one.
And on the note of coastal defenses - the main advantage of coastal defenses, particularly truck-mounted AShMs, is that they can use the terrain for camouflage, mobility, and to just offer protection in general. Because of ground clutter, it's harder for a ship to track land targets than vice versa, and in a wooded area like Finland, even moreso. You can effectively pop in and out of radar coverage at will, popping in just long enough to fire missiles.
However, they can only effectively strike at targets that almost deliberately wander into their range of fire. Larger fjords or waterways actually mean that an enemy vessel can sail right up the middle with impunity, and land-based launchers often run into radar range issues (smaller truck-mounted sets, for example) or other targeting issues. Also, the same terrain that helps mask launchers can hinder their ability to reposition at at truly advantageous launching site.