Yes, Euro headlights are glass... they are the same Jeep uses for the Cherokee... halogen too. The frame around the lens is different, that's all.
HID would be fine too... I've got HID in my Audi and after working on them I don't think it would take much of retrofitting to put them in my Explorer. Allthough I think that factory headlights coupled with fog lights and hi-beams with driving lights give me plenty of light. I don't know what it is... we usually try to change something on our trucks.
Nothing surprises me after seeing guys converting their Navajos to Explorers and 4X2 trucks to 4X4.
Anything is possible...
I for a change converted tailights to seperate brake and turn signals.