I'd actually guess that Zulu (and, furthering this, Yoruba or Swahili) wouldn't be that hard to find speakers for. Believe it or not, they're surprisingly common, and are taught fairly widely at American universities (and I'm certain in their respective countries, as well). In other words, while a native speaker might be a bit hard-pressed, I don't think we'll be unable to find someone to speak it.
And Indonesia has a LOT of people, I'd be very surprised if nobody could be found to translate it.
Any US/Canadian indigenous or particularly old/dying language will be a bit hard-pressed, though, as always...