You may be a bit too narrowly focused on one specific manner of use for the tech. AR contact lenses would have been great back when I was a Field Service Engineer - as long as I was working in hospitals. But I also had machines on the Y-12 reservation in Oak Ridge, TN. There I would have essentially had to remove the contacts or face a court or three.

Instead of contact lenses I would probably opt for a ultra-broadband data connector that could accept a variety of sensor inputs and allow one to visualize relevant information without additional prosthetics. Such a sensors could be disconnected and the connector blocked if physical security demands it.

There are actually millions of citizens that have access to sensitive classified information. (not to mention proprietary industrial information) So the need to address this situation will come up sooner than later. By the time this tech filters down to the consumer (I'm assuming it will begin as a corporate tool.) there will likely be a fix in place already.