I'm happy with the RXL handlebars. They have the same geometry as 3t ergonova handlebars. Though they are light (sup200gr), they are plenty of stiff for me. I have them on 3 bikes (road, gravel). For reference: I'm 75kg and race bikes. On a sidenote: I once bought the wrong size and as a test, I tryied to break (i.e. by smashing on the ground)-> I gave up, they were rock solid.
Search for "RXL SL 31.8mm Carbon Drop Bar Road Bicycle Handlebar" and you'll find them.
For wheelset: have a look at light-bicycle or farsports. They make custom wheels such that you can choose rim, hub, spoke etc as you desire. Around 1000USD you have plenty of options to go lightweight.