Change the User Information Displayed When Suggesting

Is there any way to change the text displayed when a user begins typing the username in the Messaging Plugin "To" text field? I know that I can edit the messaging.php file and adjust it there, but that will break future updates.

The reason I would like this change, is that we run a fairly large community site and want users to be able to communicate one with another, but don't want to openly display personal information like an e-mail address to every other user in the community.

So I was wondering if there was a better way to make this edit, than manually editing the code starting at line 119 of messaging.php.

if ( ! empty( $user_query->results ) ) {
                foreach ( $user_query->results as $user ) {
                        $users[] = array(
                                'id' => $user->ID,
                                'value' => $user->user_login,
                                'label' => "{$user->user_nicename} ({$user->user_login} / {$user->user_email} {$user->user_url})",