You don't need a dummy trigger for bridges in TRNG, a normal trigger is enough.
Also, Lara reacts to bridges based on the trigger, and said object's height, nothing more, so as long as the bridge is down below she won't be affected, and when it gets near her feet she will move up.
So you can just have 1 bridge object and trigger it everywhere in the room, and move it up the same way you move the lava.
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