government: "Here's an NSL." recipient: "Cool deal. I will respect it and not mention it to anyone, but be aware that from this point forward I will always have a device that will broadcast every interaction verbal or electronic that anyone has to me publicly live in real-time to the Internet. You have the right to remain silent. Do you understand? Anything you say may be used against you in the court of public opinion. Do you understand? If you wish to continue to communicate with me, be aware that any statement that you or anyone from your office makes to me will instantly and irreversibly become part of the public record."
On top of that you can hand them a special email address for their use only and you can delete your own personal email. You can also wear a shirt with friends and family that informs them in big bold letters that everything is a matter of the public record.
This would essentially serve to shield you entirely from secret communication by placing a "force field" of publicity around you. There might be some law somewhere that prohibits this tactic, I cannot imagine how they would counteract this tactic legally so long as you always greet them with disclosure that your are recording everything. I imagine that they could try to force you somehow to interact with them in a location that prohibits recording devices.