If we can accept key keeping authorities (contradicts R3 in Gav’s requirements) the question remains if the final standards will provide contextual pseudonymity (req. R5: “privacy”: sticky pseudonym per service for uniqueness but unlinkability of presentations to different services for privacy). AFAIU, it is too early to know.
What the Demo app provides is certainly not viable for anonymous PoP as the goal of these signatures is to be able to verify the signer’s identity.