A neat trick is to lay out what you have and then weigh it. you might be very surprised at the all up weight.

i have a FIZIK multi-tool that has a standard and Phillips screw driver, various hex keys and a combination chain breaker and spoke key. The chain breaker is used with the 5mm hex key as the turning handle to drive out a chain rivet. For touring I'd recommend a decent multi-tool rather than a bunch of loose tools. I also carry at least one spare tube. If i flat i just check the tire and then put in the new tube and repair the other one in camp.

If you don't mind my asking, why do you want to take a pedal wrench or a headset wrench? if the bike has a threaded headset then 2 wrenches are required to adjust it. A properly adjusted headset should not go out of adjustment on tour.

I'd forgo the cutting board, spatula and wooden spoon. You can always carve a wooden spatula if you really need one.

How about a reuseable coffee filter instead of 100 paper ones?

i found thay a long butane BBQ starter is ideal for lighting my stove or for starting a fire. This is a lot better than matches or flint and steel in windy or rainy conditions plus it keeps fingers away from the flame.

Flashlight? Why not use your CygoLite headlight instead?

Instead of long underwear I take another light layer of clothing. i can then wear as much or as little as I need and can stop anywhere and take off a layer if I need to.

I think you're looking at a fairly hefty load as things stand. Not only would I be concerned with the weight but also the bulk. Things like extra eyeglasses (clear safety glasses) in a protective case or wrapped can take up a surprising amount of room.

With clothing I always try to get everything to be double duty if possible. A cycling cap is great for giving shade if you need it plus it's light and compact and can be wetted for extra cooling.

Good luck with your planning and also with your tour.

Cheers