How do you get BSP brushes to move when loading a level instance with an offset location?

The setup is simple… I am calling Create Level Instance in blueprint somewhere…

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Then, back in C++ land, I get the ULevelStreaming object:

			ULevelStreaming* levelStreaming = UGameplayStatics::GetStreamingLevel(
				world, FName(*uniqueRoomInstanceString));

Then, I set a location for the new level via LevelTransform:

				static const float ROOM_SIZE = 2500;
				const FVector roomLocation(x*ROOM_SIZE, y*ROOM_SIZE, 0);
				levelStreaming->LevelTransform.SetLocation(roomLocation);

So, this method works for Actors, but BSP brushes like regular physical geometry don’t update to the FVector offset! Is there some other method I should be using to do the same thing to BSP brushes? Or is this just not possible?..