Switch to Battle Mode in First Person View

A hotkey function to switch to topdown view during first person mode, with all rooms obscured by fog of war except the room the token has entered.

Context:
So ive made a few maps for a campaign and plan to stream it for a group in first person view as they explore the maps. In the event of a battle occurring, it would be great to be able to switch to topdown view without revealing any unexplored rooms.
Once the battle has ended, pressing the same hotkey could then revert back to the view of the token to continue exploration.