[bfleming]

The Xenon light conversion is way more complicated than 2 new headlights, you need the level sensors on the suspension, the wiring loom, control modules, lights switch - it's a massive job, definitely not DIY unless you're very competent. I wouldn't touch it personally.
I'm away for the next couple of weeks, but if you fancy a trip down to J10 of the M1, I'll help you with coding - or at least determine if any is possible.