1 - Checking the oil, seeing there was enough, disable or work around the oil sensor and restart the engines. With the oil sloshing around it's likely the engines would still be OK. Just run one.
2 - Put oil in? Don't they have some extra oil? You;d think there would be enough extra oil on board to at least get one engine going
3 - Take the oil out of one engine and put it into the other, so that one engine will run.
4 - Have the helicopter deliver the oil?
Also, it's still unknown why they set out into bad weather. Looks like a lot of incompetence again, to me. More and more crews only know how to push a button and don't actually understand the systems, the mechanics and how to solve emergencies. This one, they had a day or more, you'd think some mechanics back at the company or engine manufacturer could have come up with a solution.