Okay but the LCS’ were originally fully commercial ship designs adapted for USN work so perhaps that could be acceptable. Adaptation seems to be okay. For example the USCG National Security Cutters have no - zero - vertical launch cells yet it’s still in consideration. Surely the hull would have to be heavily modified to add some unless this is purely an ASW vessel.
Actually, the LCS ‘adaptation’ and conversion seems to have been a pretty comprehensive disaster.