Ok Blast from the past here.
I have a old RocBox sitting here that still works. I'd be willing to give it a whirl. I just have no idea on where to start. The chipset on it is supposed to be the same as that of a iPod, so I wonder how easy it would be to do.
Since there is no more support for this player from RocDigital (Damon Dash & Rocaware) I am not too worried. I no longer have any drivers for it for windows, however I can access the drive just fine from my Mac and a couple of Linux builds.
Tom