[mushufasa]

As you said, there's literally no formal process for retail investors to communicate to the funds.

This startup organizes retail shareholders to use their rights via petition, e.g. https://www.yourstake.org/ask/vanguard-demand-companies-disc... .

So as a verified shareholder, you can signal your support for various issues, and the startup then arranges a meeting with the fund managers if enough people support the idea.