Each of the ideas you have is noble and well intentioned, and if they could be done, they would be done.
No expense is being spared here - they have already deliberately destroyed $26 billion dollar reactors in an effort to control the reaction, there's no lack of willingness or ability to try ANYTHING to cool the systems. The reality is that the scope of destruction is so incredibly vast and the most basic assumptions we have (Get a crane! Get a fire boat!) are crippled by a lack of roads, fuel, debris in the ocean, on the land, everywhere. Roads completely gone. No food, no water, it's snowing.

This is, in every definition an apocalyptic disaster.