3rd Camera options

Currently running an fx3 and a A7siii but looking to get a third camera mainly for the ceremony and possibly reception things. Any recommendation on a camera? Not necessarily looking to dump the cost of another fx3 unless I need to. This camera would most likely be paired with 70-200 or 100-400 as to be out of the way but still be tight enough to be locked on either bride or groom during with one of my current cams locked on the other