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Sounds like these people would be much more likely to see a message and would be plenty capable of passing it on to Bill if they see merit in it.

Yes to get to someone like Bill will be a two jump exercise.

I have heard of a healthtech startup in Cambridge, UK that is supported by Bill and Melinda Gates Foundation. The company is simprints(https://www.simprints.com). Contact the founders of that company. One of them is Alexandra Grigore (https://www.linkedin.com/in/alexandra-grigore-8aa20186)