It was the same thing after 9/11. Umpteen hundred ideas from all over about how ATC should be able to control aircrafts as a contingency using various contraptions and "secret" codes. But only good people would be allowed to use this technology see... Tossers
Something even only similar to these ideas is bound to create a heck of a lot more problems than it would solve.
The day I find something like this in my plane is the day I retire and become severely interessted in bingo and neighbourhood watch duty.