The laser assembly is just an input to some complicated processing, right? And even some of that complicated processing is just an input to some even more complicated processing. Part of that processing is feedback to the laser assembly (accel or brake, for example), and some is signal from the disc -- some sort of RF signal, which isn't yet video and audio so much as it is "proto"-video and "proto"-audio, to be turned into RGB/S-video/composite way down the line somewhere.
(You know where I'm heading with this, don't you?)
Could it be possible to build a Franken-X0 that would use the high-quality laser pickup and some of the early signal processing stuff of the X0, but be controlled (feedback, and latter signal processing) by something like the 925 or 2950's PAL section?
Now, assuming that it is possible -- I'm an optimist, but not an electrical engineer -- is it even remotely feasible?
I don't think anyone could argue that this would not be the best possible PAL player ever. Totally unique, and fearsome. Also maybe a waste of a good X0, perhaps, but unique and fearsome.