Sure. It's often found in the form of a court decision.
> Imagine you offer them 2-10x market value. With a confidentiality clause. And the threat of confiscation or project abandonment. I believe an amiable solution would be found in most cases.
Sure - in most cases. And for the ones that won't? You're going to have to either abandon the project, wait for them to die, or confiscate.