On tour and close to home (Ireland is not exactly remote is it?), we had decided we would simply get spares spokes sent out to us if we needed them.
So after the 1st one breaking, we ordered spares and simply had to choose a post office that was a week's cycling away. 4 days later a second spoke broke, and then the following day another one went. Now we had a problem with 3 spokes out on the same wheel, no spoke tool, no spokes and few options. Our rear wheel has a Rohloff hub and the spokes are not standard lengths... We were lucky when an LBS found a random old wheel that had spokes only 2mm longer than what we needed and the rims we had could handle that difference, but without them, we would have had to take the bus to the post office (in Northern Ireland) collect them and return to fix the bike.
Now, we carry them for both front and rear wheels, end of story and will do so, no matter where we are in the world. It is not as though, in the great scheme of things, that they are heavy after all. (After the 6th broken spoke in 8,000km on the same wheel we took drastic action, undoing each and every spoke by 1/2 turn and then re-truing the wheel. We have now gone another 6,000km without anymore broken spokes, so I guess there was an issue with the spoke tension with teh first one breaking a 1,000km into the tour.)