How to keep player who set up Lobby as Lobby creator after Teleport

Okay, so the title is a bit confusing, so let me explain. In my game, I split up the title screen and the main gameplay area into two separate places. I plan on allowing people to create and join lobbies in the title area, where the creator of the lobby can decide when to start the game and thus teleport all players to a reserved server for the main game. Problem is, I don’t know if there’s really a way to keep track of who the lobby creator is between teleports.

(A mock-up of the described lobbying system, to help explain the scenario. Pressing “Start Game” would teleport all players into a reserved server. I just need to keep track of the lobby creator to give them control over options in said reserved server.)

Yes, I know about setting teleport data, however this seems to be easily spoofable by exploiters and doesn’t provide the security or ease of use that I need.

Any ideas would be appreciated!