Vox operators seem to be perfect to be added to expedition, where they can serve multiple roles.
They can call in reinforcements, which initially would be to call in the closest x amount of wandering patrols or spawn them if there are none.
If there is a background alarm value, which i believe there is as spawns do intensify as you go through areas, they can further raise the alarm level, or when you kill them you get the auspex minigame that can reduce or stall the alarm level for a while. Or maybe reduce the enemy’s detection radius for a while.
They can also provide buffs for allies, like suppression resistance.
They should have very visible effects (radio waves, bright light or beacon, etc.) when both performing their special action or providing buffs.