There might be a few, though they may be small or low quality. The reason for so many servers being unlike basic NWN is because many builders wanted to explore creative new ways to express the systems of Neverwinter Nights. A lot of persistent worlds are built for socializing or roleplaying, and the basic gameplay is enhanced by these servers to better fit which specialization they're building.
You could always try to build your own, it would be a bit easier than making a modern PW. All you'd have to do is design the world, throw in shops, encounters, and other elements used by the Campaigns, and suddenly you'll have a Neverwinter-like Persistent World.