We've released PRCified versions of the campaign modules to the vault to help with this.
As a extension to this, I was able to get PRC 3.5 to work with EE easily by using the PRC-fied files.
All you need to do is download the zipped PRC and move stuff like so:
STUFF FROM PRC ZIP -------> FOLDER IN EE GAME
PRCfied modules -------> /neverwinter nights enhanced edition/data/nwm (backup the originals if you want)
erf folder -------> /neverwinter nights enhanced edition/data/txpk
tlk folder -------> /neverwinter nights enhanced edition/data/tlk
HAK folder -------> /neverwinter nights enhanced edition/data/hk
Database Folder -------> /neverwinter nights enhanced edition/data/ (I just dropped into here to create a new folder)
Works like a charm. No need to make characters outside the game nor install the original game to do it.