With todays technology would a fleet of remotely operated MCM vessels be a better choice? Control stations could be agnostic to platform to allow AOPS, or your suggested higher speed OPV to be the control point. This should be a simple process with a VARD design supporting a recycled BAE 57 mm cannon and facilities to support Skeldar but equipped with a helipad to land upwards of a Cyclone if needed. Something along the lines of the UK River as to capability. IMHO these would be excellent vessels for the constabulary tasks of fisheries protection, SAR, border protection more in line with RCMP, CBSA, Fisheries and other government departments. Instead of Coast Guard red and white these vessels would be grey hulled for use in the Carribean and off Africa but would be used in home waters as noted above.