The biggest issue actually is the fact that these people need to be constantly accessible ingame somehow.
I'd rather suggest making a seperate forum branch and make a list with people who are supposed to be those advisers, and when they reply to the topic that's it. It could also be done via PMs if the issue is secret.
Still, I don't think it should just be volunteers, also being voted in. E.g. a panel of 5 members, who will be replaced based upon applications.
I'd be interested, but am going to apply later depending on how you do build this in.