Pass post title as URL parameter

I think adding the new link by hook will be the best way.

function new_nav_menu_items($items) {

    global $post;
    $post_slug=$post->post_name;

    $landinglink = '<li class="home"><a href="' .get_page_link('YOUR_LANDING_PAGE_ID_HERE').'?from='.$post_slug.'">' . __('BLAA') . '</a></li>';
    $items = $items . $landinglink;
    return $items;
}
add_filter( 'wp_nav_menu_items', 'new_nav_menu_items' );

Change ‘YOUR_LANDING_PAGE_ID_HERE’ with landing page ID.
Cheers