I've been meaning to update this thread based on my recent information. It took a few weeks, but I managed to acquire the Xenon Headlamp Retrofit through my service center. According to the shop foreman, a lot of the parts are still acquirable through special order. I didn't have him check on any other parts, as they were about to close, but he mentioned seeing close to 30 sets of Xenon kits in inventory.
I suppose that's better than 5 or less in stock. I'm hoping it's the same case for the rest of the parts.
Got mine a few weeks ago. Look carefully as some units have a few defects in the plastic...