How to Let People Know You Are Engaged

So when a couple gets engaged, the woman gets a ring. It is an automatic symbol of her commitment. It says, "I am getting married." The man doesn't get anything like that, but I want people to know that I am engaged too. How do I go about that?

Here are a few ideas that I have had:

1.) A man-gagement ring - A man-gagement ring is like the male equivalent of an engagement ring. There is a problem though. If a man is seen wearing a ring on his left hand, people will assume he is married rather than engaged. If he wears a ring elsewhere, no one will care. Here is my solution. The ring can be worn on the right ring finger, but it has to stand out so people will ask what it is. To do that, it has to be even bigger and bolder than a male class ring, which we all know is quite a feat. I am thinking it would have to be something that would make Jay-Z cry.

2.) An engagement shirt - The man could wear a t-shirt everyday that says, "Sorry ladies, I'm taken." This sends the really important message in a polite and apologetic way. There are two problems. One, it is just too blunt. Some women might see this and start crying because they realize they have no chance. Guys see an engagement ring and still think they have a chance (yeah right). The other problem is that you would need several shirts or just do laundry everyday. Also, what if you have to dress professionally - an engagement tie?

3.) An engagement tattoo - This could be done in several ways, a tattooed ring around the left ring finger in classic barb wire style, a heart with initials on the left bicep, or a stamp that says, "Property of _________." All of these are creative and elegant options, but tattoos are so common, that if you are already tatted-up, what are you supposed to do?

These are all the ideas I have so far, but I would really like to know what ideas you guys might have.