Right now I have Towny configures so chat will appear as:

[Nation] (town/nation title) <name>: <chat message>
But how do I make certain people have an extra prefix in front of all that Towny?
What I've tried makes the entire thing in front a mess of words.
Can somebody point me in the right direction?

(I've tried a plugin that simply gives prefixes, and usi g Permissions plugins to give groups prefixes. Both do not work.)