A wallet per job has to stay free
Fresh addresses are normal practice. A protocol that punishes them will not be used.
Agents, brokers and firms use a different address per transaction for ordinary reasons: bookkeeping, separation of client money, and not publishing a running total of their business to anyone who looks.
Any design that attaches a credential to an address taxes that habit. The fresh address has no history, no binding and no licence evidence, so the careful professional looks exactly like the impersonator.
Attaching the credential to an identity key instead removes the tax. The identity signs a delegation naming the operational address, with a scope and an expiry, and the evidence stays where it accumulated. That is RVW-3.
The unsolved part is enumeration. Published delegations let an observer collect every address an identity has used, which is worse than using one address openly. A Merkle commitment with selective reveal stops the enumeration and does not stop timing correlation. Open problem OP-4.