The LINK charms are no longer tied to a single location. You can have as many charms as you like (no upper limit, only what you can carry), and the links are persistent. They aren't removed by a server reset. It took me some time to figure out how to do this without the use of any variables on the PC, charm, or campaign database. Enjoy!
It occurs to me that the links will work for anyone, so this would be a way for a lower level to join a higher level. The higher level player could transfer the return charm. I'll have to consider if that's something I want to keep.