Get the addons without externals and just put threat-2.0 at the top level, this will work great if you're using wua or jwowupdater.
I've had it set up that way in the past, but I kept running into a Addon X and Library Z updating, but Addon Y breaks from the new library, so I just leave things as they are. And no, I don't use updaters. I tried one and it caused blue screens for some weird reason. (I don't have blue screens otherwise.)