I'd like to make a cold storage wallet such that if it is found it will appear to be an empty wallet unless a password is used to decrypt it. This site xmr.llcoins.net was recommended by moderators, but it still seems like an unofficial method, and I'm worried about decryption method being lost. Also if it hasn't been tested thoroughly I'd hate to send xmr to nowhere and have it lost.
Is there any plan for an official encrypted wallet generator to be run/distributed by core team?
I would like any encrypted wallet to itself be a valid wallet. You could create an arbitrary tree inside with different passwords for duress situations.