I am perfectly okay with a South America land receiving an Indiana Jones ride as him not being animated makes him more grounded in reality for a realistic land. Pandora fit the mystical aspect and the conservation aspect of Animal Kingdom so darn well, the IP attached does not matter (as with Splash).
I really like your summary as it is exactly why Indiana Jones should go to Adventureland or Hollywood Studios. But in a new land tied into the animals of South America, I believe it could work out pretty well. Yes, it's not about conservation, but Kali, Kilimanjaro Safaris, and Flight of Passage are, so I don't think by it being slightly off the main message using exploration is actually that bad of a fit. It is certainly nowhere near as bad as GOTG in Epcot, but it isn't ideal. And while Indiana Jones Adventure is 100x better than Dinosaur, it would be a waste of money to retheme it. The amount of cash required makes me believe that TDO would cheap out on this one. Indy has absolute perfect immersion, so any gaps in Orlando would be very noticeable.