Most of these remotes are proprietary... The safest way maybe is to buy LCD panel with serial interface (there are some on the IT market) and try to combine it with Sharp remote scheme. And the most simple way to go (though the most expensive as well) is to buy LCD stereo bluetooth headset (e.g., as Nokia HS-12W) and try to connect it to Z. The only problems of this approach are: 1) You'll have to use BT 1.2 for stereo stream, and AFAIK there is only one CF card supporting it, and it's very rare anyway, so try USB dongles or solder them onto USB leads at Z's PCB; and 2) You'll have to write all the XMMS plugins, maybe using ALSA BT or something lika that, and hack the hardware profile and interface of this remote by yourself.