This is not going to happen.

I've been working at this on and off for the past year. I've been waiting for some plugins to become available, but it looks like version 5 of the vBulletin software is NOT 3rd party software friendly by design.
There is some core functionality that we utilize on the forum that is not available in v5, so it is just not a viable solution. I've looked at other software, but have not made much progress (data import tools are few and far between).
It's a little more imperative that I do something since the folks that develop vBulletin announced that they will not be releasing any more security patches for the version we are on.
I've been eye-humping the Xenforo software, but I have not been able to get their data import system to work yet. It WOULD be nice to get off of software that is as long in the tooth as vBulletin4 is.