I certainly would trash the thorn resistant tubes, they're very heavy and bulky, no reason for those, just carry 2 standard tubes. If flats worry you then get a pair of Schwalbe Marathon HS440 tires, these tires are virtually flatless, Schwalbe says their flatless but I've never seen a flatless tire, but it should be very rare to get a flat, but you take 2 tubes just in case. You also need a patch kit, so you can repair tubes, and you need a boot patch in the unlikely event you get a large hole in the tire.
Food wise all you say you're carrying is 2 Ramens? That's not food! Or did you not mention all the food you're going to carry?
Taking two spokes is a good idea but rigid spokes requires removing the gear cluster for the rear, I just take a couple of very small bottles (it's how they came) of a fiber spoke called FiberFix Emergency Spoke, because it's a fiber you don't have to remove the gear cluster thus no need to carry a tool to do that.
disposable razor? I just use a Braun M90 AA powered shaver.
Coffee? you didn't say how you are going to cook it, or is it instant? I don't particularly like instant coffee so I carry a GSI Outdoors Ultralight Java Drip maker, and then put coffee I ground from beans into a zip lock bag, it's better tasting coffee than instant. While this drip maker doesn't make fancy coffee but all the fancy makers weigh a lot more and take up a lot more space.
There is also a tent light or a outdoor table lamp that recharges by solar and it inflates and deflates to fit flat inside your pannier, it's the MPowerd Luci Original. I have one of these and I can comfortably read inside my tent with the setting on medium! It charges fast too, but don't get the version that they say you can charge your phone with because you can't, the solar panel is far to small to be effective at doing that, unless you had 8 days of pure sunshine and didn't use the phone in those 8 days!
Speaking of lights, for a flashlight all I take is an odd thing called Nebo Tino, it has a spot light and a work light, it's very slim so it sets flat, it's not rechargeable and it takes AAA bats and those weigh next to nothing.
Otherwise, you're list is very well thought out. My stuff I brought up is simply options to consider, not that my ideas are better than yours, people have different preferences of what they want to carry. I carry a 3 panel solar system so I can charge my phone and bike lights with it, along with a power bank just in case there is no sun, and I can charge the bank with solar. Some people will tell you it's a bad idea to carry solar because it's heavy and besides you're always somewhere near electricity, ok, whatever, but I can be charging something while I'm riding, the solar panel just lays open on my bike rack and it charge up to 2 items at the same time, and what happens if you're not near electricity for several days? They talk about weight yet they will use a generator hub that weighs more than the panels weigh, plus adds a few watts of resistance when you pedal. Anyway you may not need a solar unit, but if you decide you do, don't buy anything more or less than 3 panels system, less and it won't charge your phone up from dead in a day, more and it gets heavy and bulky. I bought a cheap one and it works great.
