You could swap out the saddle for some kind of light-weight ass hatchet, and find some very light tires. But other than that, you are not going to shave a noticeable amount of weight off that bike without spending 3x as much as it's worth.
For example, the lightest folding bike frame that uses 406 wheels is the aluminum (Xootr) Swift. You could get a Swift frame, swap all the Boardwalk parts onto it, and have a pretty nice single speed folder. Might cost you $400ish, more if you have to pay a shop to swap parts for you. Net weight loss? I'm guessing 2 pounds. Maybe 3.
In fact, in general folders are not light. Since most of them are missing either a top tube or downtube, they need to be overbuilt to handle the stresses.
Front brakes, by the way, are pretty vital. It provides most of your stopping power. And my guess is that you weigh a little bit more than when you were 10 years old and using that coaster brake.
By the way.... "weapon?"