One more comment to add…
I wanted to try and do a Local VR vs Non-VR gameplay (where one person is in VR and another is using the computer/keyboard/controller to play locally).
The ability to override the local mirror window (what is projected from the headset to the computer monitor/tv) is something that the VR team said would be possible in future engine updates.
That would allow you to override the mirrow window with any camera actor (it may be doable through C++, but I know we want to expose that to BP’s as well).
-W