Cannondale SuperSubFive (kg) Hill Climb Machine

Random ideas from someone who is absolutely not a weight weenie, mostly extremely impractical:

• does seatpost weight correlate with diameter? If so maybe a seatpost shim with narrower seatpost would be lighter (doubtful).
  
• is a narrower steerer lighter than a wide one? If so a 1" adapter headset thing might be lighter (also doubtful).
  
• glue/fix your seatpost in and lose the clamp (almost certainly not worth it)
  
• file down your brake tracks/pads/tyres to the wear limit (might as well file through a stack of tenners)
  
• try to put some cable stops/guides in your bars and on the frame and lose as much of the outer as possible (is this one actually a good idea??? Feed it through the inside of the bars, guide at the corner, then a hole in the bars like normal internal cables. Someone should invent that. Fiddly as hell but could work.)
  
• smaller chainring and a few links taken out of the chain (tradeoff with gear range obviously)
  
• cut some bits off your saddle at the nose or back
  
• I suppose 650b wheels are lighter in principle? Majorly fuck your handling to save a few grams
  
• shorter stem, saddle moved back to compensate
  
• throw away a bunch of spokes
  
  

I'm just here for the engineering challenge