Plain Text Password on Signup

I'm trying to display my user's password in receipt e-mails.

I found this page that got me halfway there:
http://www.amember.com/docs/How_to_store_plain_text_passwords_for_users

So the users password can be displayed only after they've changed it to something else. If it's their original password, there is no way for this to work.

How can I set this up so that users plain text passwords are created in one of two situations:
A) User creation/signup <- probably the most secure, if I can at least get this that would be great
B) Automatically for all users <- most ideal situation, if user already has account in the system I don't want the password sent to them to be blank.

Go to Setup/Configuration -> E-mail and disable "Send Signup E-mail" email and enable "Send Registration E-Mail" instead, as that one has user's password in plain text.

That almost does what I want.

I found a solution, the article I linked to suggested this:

PHP:

<?php
 
Am_Di::getInstance()->hook->add(Am_Event::SET_PASSWORD, 'savePlainTextPassword');
 
function savePlainTextPassword(Am_Event_SetPassword $event){
    $pass = $event->getPassword();
    $user = $event->getUser();
    if($pass){
        $user->updateQuick('plain_password', $pass);
    }
}

Adding a line to the top drops a hook into the login process, allowing you to generate the plain text password upon login.

PHP:

<?php
 
Am_Di::getInstance()->hook->add(Am_Event::SET_PASSWORD, 'savePlainTextPassword');
Am_Di::getInstance()->hook->add(Am_Event::AUTH_AFTER_LOGIN, 'savePlainTextPassword');
 
function savePlainTextPassword(Am_Event_SetPassword $event){
    $pass = $event->getPassword();
    $user = $event->getUser();
    if($pass){
        $user->updateQuick('plain_password', $pass);
    }
}

This allows access to the plain text password for e-mailing, including it on the thanks page, etc.