Indeed, this would be a good way to extend the obvious analogy to the Normandy invasion: all sorts of special gear was designed for that one, including "funnies" that would operate on the beach and special ships that would get them to the beach. Those special ships were built while fully acknowledging that they'd have piss-poor seakeeping, infernally insufficient speed and sometimes an expected structural lifetime measured in days. Some of the DS9 ships might thus well be of that nature.
However, the people who put these things together took the time and care to give most of them names and registries. And save for the Intrepid with Constitution nacelles, the registries plausibly match the "era of the components", supporting rather than undermining the idea that registries are roughly chronological. All of the registries also predate, say, the Defiant or the Voyager. Plenty of time for Starfleet to design and build these ship classes the usual way.
Timo Saloniemi