Take your frame, and leaving the wheel in the dropout with the QR removed, grab the stays, make a wish, and pull them apart like a turkey wishbone.
If you can get them spread another 5mm (using the wheel as the gauge) fairly easily, you have the answer. Buy your stop gap wheel, and enjoy your trip. If not, shop harder, or shell out and have someone rebuild yours this week.
__________________
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.