I am pretty sure the OE igniters are a part of the ballast.
What I would do if I were in your shoes is to buy a set of the Spyder housings off of eBay, retrofit in the EvoXR projectors. You can get almost everything you need on Theretrofitsource.com. I am currently in the middle of building bixenons headlights using the Spyder housing and Evo projectors. If you're going to spend the money and time, you may as well do it right in the first place.
Fits Black 01 03 E53 x5 CCFL Halo Projector Headlights Lights Lamps Left Right | eBay
https://www.theretrofitsource.com/co...l#.VuMNrvkrLIU