Dif'rent strokes for dif'rent folks.
I have a 2.0Ghz P4 that runs PPC faster under windows. I start Linux PPC with a minimal X11 session just for PPC.
Under these same lines, it was pretty easy to set up a linux kernel and XDirectFB(or any x server really) to automagically start pearpc using xinitrc
Just choose the OS X entry from your lilo or grub, and off you go.....