<Bemused look> Err... I've penciled it in, right after transformatively improving how scale is taught K-undergrad, and creating a nucleons-up through materials leaning progression for K-6 ??? Not really... though I do wish I could find a community interested in such.
I sometimes see discussion threads, "describe a side project that you'd really like to see happen, but don't have time for, so that your documentation, and the group's critique, might set up and motivate someone else to take it on". I don't know that I've ever seen that on HN. And while there are some hackathons in geology, I don't quickly find any for geology education or outreach. Maybe the current trend towards virtual hackathons will encourage such.
IOW: excellent idea, when do you start?