Freight Elevator Lobby Issue

So to build off my Fire Door question.

I have a Freight Elevator Lobby the customer wants to control access through from the Lobby into the space. The issue is egress out of that lobby to get to the egress stairwell.

I originally brought up a delayed egress maglock that initiated when the door moved. Replacing the handset with a pull handle. But since it is fire rated this cannot be done.

So does anyone have a solution? Must stay positive latched, must be fire rated, must be able to be...

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