Yeah, that's a problem. Even a script just returns an orientation of 0,0,0. While it would be possible to script the motion of the second camera, determining the orientation of the first camera mathematically based on its location in 3D space relative to the location of the object it's pointing at, that might be over complicating things. Not sure of your requirements but one possible solution might be to use camera targets, each camera pointing to a different target. In the frame where the cameras switch, if both targets are in the same location, and both cameras are in the same location, for that frame both cameras should show the exact same scene (so long as they are of the same type etc.)