As soon as I learned about these retrofits I got the bug as well... I havent found anyone local in SoCal so if you do I would be interested as well.
Seems like anyone who has developed a reputation on the forums seem to command a pretty hefty premium for labor, and if you are going to spend that much, you should probably be looking at some good OEM TL projectors instead of morimoto projectors on new housings if you have a yellowing issue... at least that's the conclusion I came to for myself.
My friend did his own using a morimoto projector and even though its time and labor intensive, its really not that hard. I decided the DIY route but I haven't pulled the trigger on the components yet... but its the only route that seems to make sense unless you just have some real cash to throw at the problem.