Autofill without unlocking vault.

If I understand this correctly, this is effectively the same as the request in Super secure items, but with the balance at the other end of the scale, i.e. keeping every other item in the Vault inaccessible while allowing access to just one item, insofar as there is tiered access to items. This case would be much more difficult in that it would need each item to be separately encrypted.

Alternatively, a single item could be cached, making it available for the autofill while the Vault is immediately locked. While easy to say, anything involving caches is inherently difficult - more so when it's critical to fail closed, i.e. with no secrets left exposed.

A more practical approach would be to have a very short timeout on the unlock process: long enough to autofill enough to complete a process such as a login or checkout, but not so short that repeated unlocking is needed to finish such a process.