There have to be some vintage style helmets that have that look with modern safety materials.
(although they're probably stupid expensive for what they are)

Some of the Davida helmets fit that bill. They look cool as hell, have provisions for goggles, and are obscenely expensive for what they are.

Actually, now that I look, JP has some for ~$100 that would fit the look of that bike nicely.
Too bad they aren't marked DOT. Guess it's a toss up between aesthetics and full function.

Now this is a dead sexy triumph
http://www.twowheelfix.com/showthrea...789#post489789