Hello,
I’m not sure if this is what you are looking for, but I took your nodes and moved them to BP Class based on Actor. Then I added a volume there (you can change it for some custom switch with activation and deactivation of course) and made a variable with camera reference (Target Camera) and referenced player character with Get Player Character node. I made Target Camera editable so after placing the BP on the map you can choose in Details tab any camera actor already placed on the same map. It works, but now you will probably need to find a way to immobilize the player during this camera change.
PS I made it in 4.8.3.
