Default SHIPPING country

In my shop, products are shipped to the Philippines. The shipping checkout information should thus always be based on the Philippines. I need the Country field to be set to Philippines by default. I found this code:

/**
 * Manipulate default state and countries
 *
 * As always, code goes in your theme functions.php file
 */
add_filter( 'default_checkout_country', 'change_default_checkout_country' );

function change_default_checkout_country() {
  return 'PH'; // country code
}

It works, but it also changes the country to Philippines in the Billing area. I need to prevent that from happening.

So my question is: how can I set a default country for only the Shipping details? NOT the billing!

https://wordpress.org/plugins/woocommerce/