ask Jure Berk if he will build you a seatpost/saddle combo. that will save a chunk of weight.
Got one of those it's pretty special!
That's a 400g ish post and saddle you got there my Berk rated for my 85kgs is 147g
Extralite head set is expensive and a little fragile and the weight drop is more like 35gs ( not worth it )
If you have the evne expander and cap it's a 55g set up vers 11g for the extralite setup
New forks are not going to net much and will cost a boat load
Extralite stem is good stuff and a 40g drop
Cranks will make this work for you though... THM m3s will drop 150-200g on this setup and with the right rings will take the shifting up a level or 10!
How about a detailed parts list
Then the guess work can be laid to rest
It's a pretty looking bike either way