It bugs me to no end that so many NPCs that can follow you have the same actors doing the voice. I do not do modding so want to know if it is possible to:

Extract the voice files from the bsa.
Rename some of the files to the ones a particular NPC uses.
Install these as loose files (so BSA ones are not used).

This is based on the assumption that each NPC contains pretty much the same dialog for their class (like housecarls, mages, warriors).

Or can this only be done in the CK?