How to set purchase limits for an international order only (WooCommerce)?

I have a client based in Australia and needs to limit the number of products per order to 5 items only via their online store (WooCommerce) for international order only, due to restrictions on shipping international. However, still allowing Australian based customers to have no limitations.

I have looked at WooCommerce Max Quantity (https://en-au.wordpress.org/plugins/woocommerce-max-quantity/) however this puts the limitation on all purchases and not only international.

How to set purchase limits for an international order only (WooCommerce)?

 can any please help?

Is it possible to have a Table Rate rule attached to their international Shipping Zone with a quantity range 1 to 5, and with no other rates over 5? Cleanest option is a filter rule that attaches a maximum order size to a shipping zone and displays ‘Call for Price’ with anything over the maximum.