I have not heard of such a setup, but now that the earliest MagicBands are approaching (or beyond) the expected end of their lifespans, perhaps we'll see something put in place.
Back when this issue first came up in discussions, the engineer in me hypothesized a simple setup they could install at Guest Relations locations: Have your typical tap-reader on a post or mounted to the wall connected to a long-range reader x-number of feet away (mounted in the ceiling, for example). When you tap the reader, the system then also looks whether it can "see" that same Band using the long-range reader. If yes, you get a green Mickey head. If no, you get the blinking-blue "there's a problem" indicator.
Assuming that there is some kind of direct correlation between the serial number from the tap-to-read tag and the serial number the powered long-range tag broadcasts, such a system wouldn't even have to be connected to the MDE network. It could be a stand-alone setup.
-Rob