Change local chat so that it still shows the correct number of people in system, however their names (and affiliation/blue status) are hidden until they speak up.
That way, it becomes considerably more difficult to use local as an intel tool, while keeping most of its functionality as an information tool and chat service.
A deplorable NS/LS Structure that shows up on an overview that allows targeting a neighboring system by either jump gate connection or within 5LY and will render local chat identical to wormhole local chat. This allows for the removing of local to be gamified. Entering local in the targeted system will provide a local warning that chat is disrupted due to a signal from the originating system.