It sounds like you want a different PGP key associated with the second account? If you are using PGP at the desktop level, instead of at the Universal Server level, this can easily be done. You can generate a second PGP key with the email address of the second account. In PGP Desktop, you can select the PGP messaging service you want to change, and then select the drop down arrow for Default Key, and set this to the new key.