OP: you indicated you were touring in "Europe", but didn't say where. The "where" may prove important.
I seem to remember @
Bike Gremlin saying on his website that Campagnolo components/parts are uncommon in his nation (Serbia), and that Shimano components/parts are much more common. The same may be true in some other parts of Europe as well - particularly in the former Eastern Europe.
From what you've posted earlier, you apparently already have a Shimano-compatible freehub or rear wheel. You might be best off spending a bit and getting/installing a good used or new Shimano or Shimano-compatible drivetrain (crank/chain/FD/RD) and shifters that will handle the wide range cassette you plan to use. But it's your tour, and your legs - so it's your call.
Best of luck, and enjoy the tour.