I bet you could run the X server build from Open2x on the Wiz. To be honest, even the main GP2X11 binaries could be run despite being statically linked because they don't touch the hardware at all, just /dev/GPIO and /dev/fb0. Parkydr has managed to get some GTK+ stuff running on the GP2X before, and nemonoid got the whole of GPE going (both of these years ago), so I doubt it would be that hard on the Wiz.
X is far from a Pandora-exclusive feature, I did it on the GP2X back in 2006
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