I don't know of a kit and it would be hard to think of something that would have a smaller bang for the buck than that. If you found a source for titanium axles (front and rear), and a titanium swing arm bolt, you MIGHT save two pounds or so. The small fasteners won't even make a difference.
Titanium shock springs are around, if you REALLY have that much money burning a hole in your pocket.
Air up your tires with helium and call it good. Put your money back in your pocket, or send me half for the sage advice.