That's a great idea. I've got an iLok device as well as the dongle. At home It's not so much of an issue, but I've done a couple of demos and have church installations where there is a possibility of one or both dongles going missing.
With a couple of my consoles I've ended up with a USB hub inside the console. That's another possible place to install a dongle, especially in a public venue if the computer is accessible.