They could have made Dev Patel play Sokka and Jackson can now replace Jesse as Zuko. That way, at least the only "whites" are the Fire Nation, while the Water Tribe can be tanned. As for using Red Cliff as an example, if it was financed by a major company (like Sony for Crouching Tiger) rather than an independent one (like Weinstein), then at least the movie will more profitable due to the larger marketing. Same goes for Forbidden Kingdom (Lionsgate).