The basics (which you probably know) are drilled rims and tubeless.
From there you could look to further drilling rims if possible or lighter spokes - but those would just be grams and probably not worth the effort.
Or look for lighter tires.
Although you said no carbon...
After that the biggest weight savings would probably be swapping out the steel Surly bars for light alloy or carbon flatbar with similar bar ends.
Check the saddle weight and swap out for a light one if applicable.
Carbon or light alloy seat post (dropper adds weight).
Carbon rigid fork (again, suspension adds weight).
Go 1x to lose some drivetrain weight.
The problem being that adding suspension, moloko bars and dropper post probably added exponentially more weight than any saving from an already tubeless drilled wheelset could ever yield. I know, not what you were looking for.
Last edited by Happy Feet; 01-01-20 at 11:40 PM.