I wonder about the overall sea-keeping ability of that hull design. The navy is buying the FREMM design for the next frigate. That might be a little large for a cutter, but there are smaller foreign frigate designs that would fit the bill.
The USCG already has a program of record to acquire the Offshore Patrol Cutter, so a new design has already been selected.
Current plans are to acquire 25 of the 360' OPCs at an estimated $411 million each. If half of those could be replaced with ex-Navy DCS hulls, that would be a significant savings to the U.S. Taxpayer.