Ask DM Wraith for options I suppose....
Another trick can be to quickly rename your different nwncdkey.ini files before you start nwn.
Like: You keep a nwncdkey_ingwik.ini and a nwncdkey_modesty.ini on several computers,
and you rename the according file to "nwncdkey.ini" before you play.
In general: MAKE PLENTY BACKUPS OF YOUR DIFFERENT ACTIVE nwncdkey.ini FILES!

It's easy to accidentaly delete one of the files with the renaming so make sure you have plenty of backups on all computers heh.
cheers,
Xillie