Buff Immunity Timer?

[s1lence1]

I'm trying to get a buff immunity timer working for Jester's Cap II and can't seem to find anything that works with DarkUI. Since it's not considered a maintained spell it wont show up in the custom window. Is there another setting that will show me time remaining on spells applied to other players such as Energizing Ballad, Jester's Cap or Ethereal Conduit II?