Joined: Feb 2013
Posts: 1,472
Likes: 11
From: Near St. Louis, Missouri
Bikes: Giant Defy Advanced, Breezer Doppler Team, Schwinn Twinn Tandem, Windsor Tourist, 1954 JC Higgens
You could carry the spline tool needed to remove the hub. Park Tools makes one for under $10 that should work. It's not all that large or heavy. Any LBS should have the chain whip and a suitable wrench.
Before a long tour you might want to put on a new freewheel (and probably chain). I just saw a NOS Sachs freewheel on EBay.