Triumph has just released the Steve McQueen Limited Edition, based on the Scrambler 1200 XE. Only 1,000 units will be available. (Triumph Motorcycles/)Triumph has done a pretty good job of marketing its bikes from a heritage standpoint over the years, tapping into the firm’s long history with racers, musicians, movie stars—basically pop culture figures writ large. Think Marlon Brando, James…