Different style
For overnight trips at campsites, my goal using a 20lb carbon road bike is 20-30lbs of added weight to the bike. This is with lightweight tent, instant freeze dried meals, tiny propane stove and sleeping bag. I have no idea what it would be for a longer tour like yours though. Seems like I would be inclined to take more food and clothes.
I am always surprised how heavy water and warm clothes can be so you might target those areas.