How to redirect all page requests to a single “goodbye” homepage? [duplicate]

I found the answer with a little more searching. Sorry — Admins feel free to delete this question!

The answer is here

add_action( 'template_redirect', 'wpse_76802_maintance_mode' );

function wpse_76802_maintance_mode() {
    if ( ! is_page( 1618 ) ) {                                                                                  
         wp_redirect( home_url( 'index.php?page_id=1618' ) ); 
    }    
}

EXCEPT …. if there is a way to enhance this redirect so that a 301 header gets added into the mix, that would be even better.

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