I would add a few things
Sounds like a brevet to me, so pack as if you are going on one.
a) Duct tape, unroll around a pencil about 6 feet worth.
b) Spokes, check length for rear both sides and front. They take little room and
tape them to to frame or rear rack bag.
c) Basic first aid, bandages, gauze, Advil.
d) Endurolyte pills.
e) Extra batteries of whatever model you are using in your flashlight. If the flashlight has a Battery pack and you will not be able to charge it, then bring an extra strong flashlight.
f) Helmet light, small but able to scan the road. Critters move around at night, deer, maybe a bear?
g)Extra tire if you can
h) Tire boot kit
I) Pump, test it before you go.
j) Patch kit, ya never know
k) cell phone, extra battery
l) Zip lock bag for cell phone, wallet. It can rain, plus sweat can ruin either.
n) EXtra pair of socks
o) leatherman type pliers,
p) extra nuts and bolt for rack
q) Toilet paper, hey ya never know
None of this weighs too much, better to have than not.