Set password link in welcome email

Dear MailPoet developers,

I want to send a welcome email to new created WP users with a direct link, where they can set the password (not the same as reset password or lost password). Unfortunately, it seems that this is not yet possible. It would be great, if you could implement a shortcode for a set password link. This would be something like:
$password_url = network_site_url( 'wp-login.php?action=rp&key=' . $key . '&login=' . rawurlencode( $user->user_login ), 'login' );

Thank you very much!