Custom permalink for specific category

I’m trying to create a custom permalink for a custom post type and have it only apply to a specific category. For example I want to change this URL from: to

This is the code I have so far which doesn’t work:

function change_webinar_links($permalink) {
    global $post;
    if(get_post_type() == 'tribe_events' && has_category('webinar', $post->ID)) {
        $permalink = trailingslashit( home_url('/webinars/' . $post->post_name  ) );
    return $permalink;
add_action( 'init', 'webinar_rewrite_rule');
function webinar_rewrite_rule() {
    global $post;
    if ( has_category('webinar', $post->ID) ) {
        add_rewrite_rule( '^webinars/([^/]+)/?', 'index.php?tribe_events=$matches[1]&post_type=tribe_events&name=$matches[1]', 'top' );

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