I think if you get twenty people replying, you may get twenty different viewpoints. I would leave the Tokina wide angle lens, the Nikkor 50 mm and the Nikkor macro lens. Between the Tamron 18-270 and the 200-500 mm you can cover everything between 18 mm and 500 mm.
Sure the macro lens may be nice for close-ups, but I suspect on safari most of your shots will be landscapes or animals shot long distance. As for wide angle needs on safari, the 18 mm of the Tamron should be able to cover all but the most demanding opportunities. I might also consider leaving the D3200 body home. Yes, it will be a disaster if the main body fails and there is no backup. Then again I have been on numerous such jaunts and I always had only one camera with me. Touch wood, I've never had a body fail on me yet. If you feel you must have a backup body, then take that in place of one or more of the lenses I would leave anyway.