/* Remove the default publish meta box
 *
 */
add_action( 'admin_head',  'cs_admin_meta_boxes' );
function cs_admin_meta_boxes(){
    remove_meta_box( 'submitdiv',  'cpt_name', 'side');
}

/* Add meta 'save' meta box
 *
 */
add_action( 'add_meta_boxes', 'cs_meta_box_add' );
function cs_meta_box_add(){
    add_meta_box( 'cs-save', 'Save', 'cs_meta_box_save', 'cpt_name', 'side', 'high'       );
}


/* 'Save' meta box content
 *
 */
function cs_meta_box_save(){
    echo get_submit_button( $text = 'Save', $type = 'primary', $name = 'submit', $wrap = true, $other_attributes = NULL );

}


/**
 * Sets the post status to published
 */
add_filter( 'wp_insert_post_data', 'cs_force_published' );
function cs_force_published( $post ) {

        if( in_array( $post[ 'post_type' ], array( 'cpt_name') ) ) {
            $post['post_status'] = 'publish';
        }
        return $post;

}