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Newer studies have put doubt to olivine's effectiveness: https://www.technologyreview.com/2022/03/30/1048434/why-usin...

That was about putting olivine in seawater, not spreading it on soil.

My concern with all these approaches is the nickel content of olivine, which can be several tenths of a percent.

Yes, you would favor using the low-nickel supply on farmland.

I wonder if nickel in olivine would be harmful on beaches.

This is pretty much exactly the same idea: the paper referenced by the article mentions basalt specifically, which has olivine as a major constituent.

Here's a study that found that the olivine hypothesis might not work as expected: https://www.technologyreview.com/2022/03/30/1048434/why-usin...