Quote from TomberI don't see any way to detect that based on the spell descriptions in wowhead. They are guardian demons and don't have regular pet bars any more, right? So unless they give you a buff when they are out there probably isn't any current way to add a bar. There might be a way to detect with custom Lua code but I can't find anything obvious.
I was thinking on the spell cast success you could pop a bar for 45seconds.