Think of it this way: if you put some effort into repairing it, it will have even more personal meaning than it did before.

The simplest thing you could do is just drill a hole on one end to pass a keyring through. That metal looks soft enough that any basic drill bit rated for mild steel should be able to punch through it in about a minute. File off the rough bits where the tab broke off, now it's custom.

Objects don't carry their own meaning. They have meaning because we give it to them.