I have NEVER heard of anyone having to break chain on a trip! That said, back in the 80s (Pre cassette Hubs) I was on a ride with my riding buddy, when he managed the break 3 spokes on the freewheel side of the rear - and when we walked the 4 miles to the nearest open bike shop, guess what they DIDN'T have? The right freewheel removal tool! We were able to gin something up, but a freewheel tool became a standard part of our kits (He and I both used Atom Freewheels IIRC). Anyway, another trick we were taight by our "real" shop when we got there - Take 4 or so spokes of each length you use (you probably use 3 or 4 different lengths - 1 for the front, 2 different ones in the rear) and slip them INSIDE your handlebars! If you break a spoke, you have spares!

BTW, that bike shop that allowed us to gin something up? No Charge! He didn't even want to touch my friends bike (a Super Record equipped Colonogo) and let us to the work/use his shop, and said "it was worth it just to see a bike like that in his shop"

We managed to get the wheel semi straight, and get back to the Staten Island Ferry, and then to the train home, instead of riding. A good thing anyway, as I was starting to suffer "The Boink", and at that time, didn't know the proper way to handle it