A post i read in the Cosmetics and Lighting section said bake 130 degrees for 20 minutes then go around with a heat gun, with a suction cup attached to the lens, and finish the separation. i vote for a DIY video!
I ended up just cutting the face off my LCI Halogens, blacked them out, and just glued them back together... i have multiple videos to put together a DIY, just need to sit down and edit it before i post it.
Btw, the best suction cup to use in this sense is to get one from Lovers (yeah, the sex store)... these things can hold up a 200lb person, they can sure as hell pry apart a headlight! ^__^