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Yeah this is what I thought...

I just found a way to create it from inside a Front Controller :

require_once _PS_ROOT_DIR_.'/app/AppKernel.php';

class IndexController extends IndexControllerCore{

  public function initContent(){
    global $kernel;
    dump($kernel); // null
    $kernel = new \AppKernel('prod', false);
    dump($kernel); // kernel with null container
    $kernel->boot();
    dump($kernel->getContainer()); // Container OK, we can call $kernel->getContainer()->get('service')
    die();
  }
}

Thanks

Florian

Source: full article in https://blog.floriancourgey.com/2018/05/how-to-work-with-the-symfony-kernel-anywhere-in-prestashop-1-7/

PS : refacto to put on in /override/classes/controller/Controller :

  protected $kernel;  

  public function __construct(){
    global $kernel;
    dump($kernel); // can return null

    if(!$kernel){ // if null, we boot it manually
      require_once _PS_ROOT_DIR_.'/app/AppKernel.php';
      $kernel = new \AppKernel('prod', false);
      dump($kernel); // kernel without container
      $kernel->boot(); // kernel with container
    }

    dump($kernel->getContainer()); // yay !
    $this->kernel = $kernel;
  }