The closest you will come to finding a ABS helmet is Altmann's Armour. It is made out of the same plastic that is used in football helmets. It is not the most accurate helmet out there (by far), but it is bigger than the 95-97 DP's.
Goat, I just used a Dremel with cutting wheels to trim mine. I just used good ole' sandpaper & elbow grease to get to the hard-to-reach places.