In your situation, one thing to consider is how you will feel if you pay for the vet to do a c-section and then the ewe dies anyway. I once faced the same situation; the lambs survived but the ewe was dead next morning from the stress. Fortunately the lambs learned to steal milk off other mothers, so with that and bottle feeding they reached an acceptable weight (meat sheep).
I was okay with spending the money because I was very curious about seeing a c-section done. It was a once-in-30 years experience.
