It is not just like doing a PAL - NTSC conversion in the digital realm. The fundamental differences between PAL and NTSC laserdiscs are many,and require lots of totally separate circuitry.
1) PAL laserdiscs spin at a totally different speed - 1500RPM vs 1800RPM for CAV, and different again for CLV. This alone is a big issue.
2) They are not store in composite format directly, it is an analogue system of infinitely variable width pits and lands, which represent an FM modulated signal made up of the Video and audio and timing information, flags and all manner of other information all jumbled up into the one 'signal'
3) The FM signal is split out very early in the player into its component parts via a demodulation chip - you are then left with each part in a 'proto' form that needs a hell of a lot more work before it becomes anything like video. All of the circuitry in the X0 is about taking that proto video and turning it into a crisp clean NTSC signal, it does a small truckload of processing to that original FM signal to try and recover the NTSC signal as best as possible - none of that circuitry is applicable to PAL except the output amplification stages.
So if you could reprogram the X0 to spin accurately at a different speed, and were happy to design a totally new PAL signal processing path, and then work that design into an extremely low noise design then maybe you could get something top work - but the results would most likely be worse than what you would get out of a standard PAL player.
A good part of the kilograms of bulk in the unit is the processing circutry and shielding to keep the signal paths clean - it is an incredible amount of work to try and add this level of processing circuitry without adding noise to the signal.
That is why standard home players give a picture full of video noise, it is incredibly expensive and difficult to recover the image *and* keep the signal clean.
You would be far better off taking an excellent PAL player like the 2950 or even the 925 and redesigning its circuitry to minimise noise than trying to turn the X0 into a PAL player.
I'm pretty sure I went onto more detail here on the boards in the past about how NTSC and PAL laserdisc players work, but if not I can post more info if anyone is interested.