To be honest it feels like these answers boil down to "we feel it'd be nice if this existed but we have no actual answers as to how to get it done".

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To stick with your comparison: when letsencrypt and ISRG launched they had actual answers for how to deal with the hard challenges in their space:

A) how to get included in a trust roots (crossigning with IdenTrust at first and the knowledge and expertise of how to get included in the longer term)

B) Automated domain validation in a standardized way (ACME)

C) Long term commitments of sponsorships to ensure people could trust it would stick around

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I wish you the best of luck, but I think this might have needed to bake a bit longer before publicizing.

You need to find a benevolent selfless soul who will sponsor you.