Upload & Sell: Off
I suspect you missed my joke - we won't be getting out of the safari vehicles, though we will also have a walking safari between bush camps with an armed guard. I'll move on my row to be sitting on the side of the vehicle closest to the animals, so having someone in front of me is not an option. My spouse would also not be interested in holding a screen/parasol constantly to shade my lens ;-)
I suspect that I may have to take the hood for the Sigma 50-500mm with me as the filters are more likely to find more use on other parts of the trip when I'm using the wide angle lens, eg when around camp taking panoramic shots, etc.
Fortunately, I plan to do a mini safari before I go at a local open plains wildlife zoo, which will give me the chance to test out various options and to see how efficient/cumbersome they are.