Loading Rooms in Mass Multiplayer

Okay, so I have been working on a project for a while, and I am trying to figure out a unique way to include an armory before each round.

There are 50+ players, and I want each player to have a room where they can equip their weapons for that specific round (In first person, NOT a loading screen).

The issue is that Manually creating 50+rooms on one level may make the level unnecessarily weighed down.

Is there a way to create 1 armory room, on a different level, and once all players have separately grabbed their weapons in their own room, be loaded to the next level with all the other players to square off in combat?