What about a small, cheap Coastguard-cutter-eske design operated by the UN for escort and patrol? You don't need Tomahawks and ESSM against guys in a fishing boat. That actually gives me an idea for something to draw, lol.
Yeah... The USN's already ahead of you with two hulls meant for that already in the water, they're named the USS Freedom LCS-1 & USS Independence LCS-2.