Change the deriver class of a menu link

This ticket is best placed on the admin_toolbar module rather than core.

That said, you can't currently override a deriver as far as I'm aware. The code to do that doesn't exist, see ✨ Allow base plugin definition to be altered before derived Active .

You can however override the menu links by using a module hook. Here is an example from our codebase.

/**
 * Implements hook_menu_links_discovered_alter().
 */
function MY_MODULE_menu_links_discovered_alter(&$links) {
  foreach ($links as $route_name => $link) {
    // Remove all the individual views from the menu.
    if (\str_starts_with($route_name, 'admin_toolbar_tools.extra_links:views_ui') && !\in_array($route_name, ['admin_toolbar_tools.extra_links:views_ui.add', 'admin_toolbar_tools.extra_links:views_ui.field_list'])) {
      unset($links[$route_name]);
    }
  }
}