Your system looks the friendliest I've seen so far: as to saving the keys I would love to see some kind of integration with Keychain, Hivewallet and other systems.
Outside Hive it would be great if there was a way to get keys into 1Password and LastPass and whatever else are the leading password managers. I must admit 1Password is where I store all my keys. I have to go through a tedious manual process of pasting all the keys into a window. I know the master password is all I need but it's useful to have the other keys easily on hand.