If you think the vibration was bad enough to require an inspection AFTER the fact why would you continue to fly 300 nm farther PRAYING that the engine pylon won't fail?
No maintenance? Who cares, the plane is grounded for days?
No customs? Does not matter in an emergency. And they were returning to the country of departure so there's no need for customs if you insist in being ridiculously pedantic.
Limited medical? No one is injured.
Limited ARFF? They're not burning, they're trying to land before possible structural damage.