Similarly to what causes the problem on #2654, we used a monolithic approach for designing NuCypher keyring, without taking into consideration that Alice, Bob, Ursula or any other new character in town, can have different requirements and expectations when it comes to their key custody.

In the case of Alice, and other user-side characters, it's reasonable to allow them to bring their own keys. What that means is still to be decided: is it "importing" keys from a different context? or is it allowing some sort of external signer/encryptor to interact with the nucypher logic?