Thoughts on a Wakanda pavillion:
1) T'Challa off the table. Shuri may or may not be usable, but you're probably going to have to convince a 60-year-old arbitrator that Black Panther's sister who at one time was called Black Panther is not really in Black Panther's "family." Also remember Marvel got the Daily Bugle vending machine removed from the Dr. Strange meet & greet, implying Universal believes the contract encompasses something akin to trade dress for its characters. Are panther-shaped buildings in the middle of a jungle similar? Is the word "Wakanda"? (There is no right answer yet.)
2) Potentially tip-toeing around politics here, but I could see the only representation of sub-Saharan Africa being a fictional country raising concerns about devaluation of real history/culture.
3) Fanbois will holler like you're ripping out the PeopleMover. The least important issue to the Mouse but still probably a consideration.