If the pump can't be braced against the ground, then forget it. They now have diff pumps for diff bikes ??? LOL ALL Tires all have about the same AMOUNT of air. More volume = less pressure. One tube should be plenty, with SMP tires.
I'm not shy about carrying any and all tools on a long tour, even on day rides I carry most of them. My bike is old style IGH nutted, so I need a ton of stuff.
The most useful tool is the 4/5/6 mm 3 arm wrench. For actual bike fixing, I will NOT use multi tools. Those are for knives/ can opener/ pliers stuff. I carry spare spokes in my bike bins. I make sure all bolts are belt and suspenders, with a nylock nut.