Use Case: Biometric Notary

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Sorry in advance for posting this question here if not the right place.

I want to verify whether the Auditor trust model fits my use case:

Bob signs a message from an audited "wallet" app on his Pixel including a biometric fingerprint. Alice, a physical witness, adds her signature. Bob meets Susan who wants to ensure that she and Alice are meeting the same physical person. She sends Bob a nonce to sign using his wallet (the proof). Susan uses her Auditor-based app to verify the proof including the measurements of Bob's OS and wallet app.

These measurement assumptions assume that remote attestation is somewhat analogous to Intel SGX.