Identity solution! Reading threads a few days later, and I see this one crop up again in @Serotonin comment. Perhaps a worthy CIP? @Dubius seemed to support the proposal in principle in this comments thread How Cardano could fast-track financial inclusion in emerging economies - #17 by Asogan_Moodaly
Proposed solution: Digital IDs with biometrics (already proposed for Atala Prism under ‘Coming Soon’ on the website) for SPOs. Limit the number of pools per digital ID.
Becomes a fantastic marketing use case in terms of the big picture of Cardano roll out.