Tankerbuilder
I've built every USCG plastic model there is and I've never heard of any thing like you describe. Imaii offered the Coast Guard sailing barque "Eagle" (1:200)some time back, but nothing else.
Lindberg offered a plastic four boat kit in the 1950's(it has been re-issued quite a few times). The boats were close to "N" scale(model railroad) and consisted of a Tugboat, a Tow boat, a Fireboat and a Tuna Seiner. Each boat was full hull and measured about 4 inches in length.
Coast Guard models are few and far between as modeling subjects go, having served in the CG for 30 years I'm unfamiliar with these kits. Heck, I'd love to see a series of large 1:35 plastic CG cutters, I'd even settle for one!
I took the Tuna Seiner and kit bashed it into a CG buoy tender for my "N" scale train layout. I've transformed many naval vessels into Non-prototypical CG cutters, you should have seen my "Fletcher class" CG cutter, it was a real hoot! OK, I don't paint navy ships white these days, I've learned to scratch build CG ships and boats, it's quite a challenge but its prototypical(and fun).
Mike M.