Hmmm.... I wonder if the caulk would work. My issue with the 2-part epoxy is that this it is a vertical crack, it would just ooze down the wall and not stay in the crack (this the reason that the "pros" use the attached tubes to squirt the epoxy through after sealing the inside wall to keep the epoxy IN the crack and not ON the crack, or down the wall...)
I wonder if just cramming some sort of caulk into the crack, let it dry, and then apply some of the rubbery sealer over that and to the surrounding areas if that would help keep it all nice and dry. This will end up getting studs, insulation, and drywall, so it doesn't need to look pretty.
