I have not such of these device, but I dept if Apple so closed about extract this one, even most other players should not have any issues like this. But of these devices do pop up a drive letter like memory keys, this should been very easy to add tha feature, but scanning for tags is no go, but only do a explorer like interface, since scanning tags would take to long time.
Some Jukebox software might have this feature, so I think you should checkout the jukebox section and let that software start from GameEx.
I tried to do something like this in my software, but I did not got this to work correctly (even it was not that design when I created my software, but could look in the future after I have done the music on the games I do).