My concern isn't even the weight of the bolts, though that's what he's asking about. He's pushed his saddle as far back as it goes in order to create more reach to his bars, without apparent regard for what it does to the position of his legs to the pedals. I know that KOPS isn't a hard and fast rule, just more of a starting point, but whether it's a KOPS position or something a little off of that, I'd think he should get the saddle/pedal position dialed in first, then worry about reach using stem/handlebar combo after that.

That being said, if the weight of the bolts is that much of a concern the OP could always buy some titanium bolts and shave a few grams, for whatever that's worth. We're getting pretty deep into weight weenie territory by that time, though.