This should be doable. You'll have to write your own input/output processing for the serial connection to it, as the default empeg interface is probably not the best for this specific part. With your own userland app controlling it, the sky is the limit here. /proc/empeg_notify (from Hijack) provides much of the player status info (track titles etc..) that could be relayed out to the display. Or you could get much fancier and more complex by digging into the dynamic data partition..

Cheers