World Composition removes ability to use Individual Streamed Maps?

So I have a game with loads of details, but requires a lot of optimization to pull it together. Its also a fairly large environment covering the size of around 4.8 kilometers. Not all of it is explorable, but the distance between scenes can be vast and would require what World Composition offers. The problem here now is that I stream the transitions between exterior to interior seamlessly with an animation that waits for load. With World Composition enabled, I can no longer use it. Now I either have to totally downgrade the visual appeal to utilize seamless transitions between interior and exterior using World Composition, or go back to Level Streaming and somehow manage to make it work with a large environment and a lot more work.

Am I sh** out of luck or is there a way to stream individuals levels with World Composition?