BIp85 style is a good start, some ratchet would be even better
Discussion
You may like this. nostr:npub1xpj4tlhygv6c9ve0d4r0zxmyfk3n39je2qtgj0ta5xx8tltlmufqpvcped has a solution that uses BIP-85 and proofs for making multiple for-purpose identities that can attest to each other's reputation, without revealing the association