Thanks for your post and relating your experiences. OCers are out there just keep looking.
Just to let you know there are some people who may not think the way you do in regards to hanging your blue card. Others see what you do as an example of the erosion of freedom. On the surface a pleasant experience but long term at the very least you train the officer to think if the next person doesn't show me a blue card they are doing something wrong. It is not legally required to have a blue card on your person. Something you might want to consider.