I would cite the Yad Efraim as well, but I don’t have it on my computer and I left that volume in yeshiva today.
From the Noda B’Yehuda it seems that there doesn’t need to be a pressing need to be mattir on the road, just the fact that you don’t have an alternative makes it an automatic b’dieved situation.
Also see Gilyon Maharsha YD 122 who says that even minhag kedoshim was to be lenient about drinking coffee from a coffeehouse that serves non-kosher. I also don’t the source with me, but if you want I can type it up tomorrow.