I think that the LCS ships would have a much larger deployment range than a fast attack craft would have, and to a good extent should be more seaworthy. One thing though that I think would be worth looking at is, consider using a large container ship or tanker siezed hull as a kind of tender for say 6-8 attack craft. I think eventually they will do that with USVs. One design that looks pretty cool is the Sea Fighter FSF-1, it does have limits to its practicality, but I think that one of those would make a really kickass platform for kind of a short range arsenal ship. Load it up with the new Netfires missiles (each of them is supposed to be the equivelent to a 155mm shell) and it could probably do a bit to help satisfy the naval gunfire requirement (I know they arn't guns but still 120+ netfires on it instead of the helo deck, would make for a pretty nice bombardment)
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