It'll be rename and respec existing NPCs. Since I have no talent for writeup so the most straight option is to hijack the official NPCs along with their stats and dialogues.At this point, I'm unclear as to whether you're trying to replace game NPCs with other NPCs of your own creation, simply rename and respec existing NPCs, or introduce 4 completely new NPCs to the game.
Oh, and I already worked out how to edit/replace names in .DLGs using WeiDU and translation method before I find out how to change their displayed names. Go figure.
Thanks for the thoughts still. I'm sure there are many other solutions in making them interested to play the game in vanilla, but so far this is the best I can think that fits my group the most.