Vanessa
Thanks for clarification. None of us are willing wearers then, for sure.
As for the registration, there's a big problem that it's written in your ID. That means everyone who sees your ID and is homophobic (still quite common, unfortunately) will give you a hard time. It's one of the main reasons why nobody really does that.
My boyfriend has the main key, and we see each other nearly every day. My parents have one key for a backup. I don't think I really need to have an emergency key, as I never needed it and I could be tempted to unlock.