I'd recomend you look for a more sensible place to save weight
I've gotta agree with GW here.
I'm not a weight weenie per se, but I don't see the point in running anything excessively heavy where I can get away with a lighter part (I'm only about 12 stone, and don't ride too heavily), but lightweight/flimsy flat pedals is a recipe for disaster!
I've got Easton Flatboy pedals on my long travel bike, and whilst they're a fair weight, they're indestructible and very very grippy. They've been smacked into countless rocks, they'd bend crank arms before a pedal axle of that I'm sure!
A Mate has some Wellgo Mg1's which are a fair bit lighter though, he is fairly heavy on kit and hasn't bent/bust them yet, that said his bike has a BB height about an inch or more higher than mine so he strikes his pedals a fair bit less!