OK, I had mine complied and I pulled the out myself because I checked the way they convert them and from what I see there is no way to convert back to Xenon. They remove the power packs (transformers/ballasts) and modify the light housing at the rear end to run a wire for the halogens as the power packs feed into the light housing internally, bit of a fu(k round really. I fitted poxy 34 halogen lights, yeah I had to change the plugs on the loom but wasn't very hard.
Depending on what Xenon’s you have it will make a difference to whether it is worth the trouble. The light the stock Xenon's give off, while nice and white is a little dim. I would love to get a brighter set of bulbs for mine but can't justify the cost.
SAU Vic members can purchase Xenon upgrade kits from Philips for the 34's as we are sponsored by them, maybe check out the Philips kits?
Another option is to look for another person brining in a 34 and swap the lights before compliance…….or threaten to dob the compliance agent in unless they give them back as they are breaking the SEVS rules They SHOULD be destroyed but hey..
If you need any info on the stock Xenon’s or photo’s etc of the assembly let me know.
Cheers.
PS - Attached is a pic (hard to see sorry) of the 34 Halogen lamps.