Keep cart active on logout

I’m trying to keep the cart contents alive when a user is logging out. I have Persistant Cart disabled, since I do NOT want to store it in their account. I only want the user to logout from the current cart, and then just keep the cart contents alive when a user is logged out.

I’m trying to observe through customer_logout. But not sure what steps I should take next.

<event name="customer_logout">
    <observer name="[vendor]_preservecartlogout" instance="[vendor][name]ObserverPreserveCartOnLogout" />
</event>

Here is the Observer I’m starting with, but not sure what actions next to take.

class PreserveCartOnLogout implements ObserverInterface
{

protected $cartHelper;

protected $quoteRepository;

protected $quoteItemRepository;

protected $checkoutSession;

public function __construct(
    Session $checkoutSession,
    CartRepositoryInterface $quoteRepository,
    CartItemRepositoryInterface $quoteItemRepository
) {
    $this->checkoutSession = $checkoutSession;
    $this->quoteRepository = $quoteRepository;
    $this->quoteItemRepository = $quoteItemRepository;
}

public function execute(Observer $observer)
{
    $currentQuote = $observer->getQuote();
    $quoteId = $currentQuote->getId();

    // not sure what to do next..
}

}