Woocommerce checkout only refresh on postcode

I am trying to make checkout faster and my shipping is only based on the postcode so I do not want ‘order review’ to refresh when address, country, state is change.

I know I need to fiddle with: woocommerce/includes/class-wc-ajax.php

Specifically: update_order_review();

Is there a way to do this by adding code to my themes functions.php rather than comment out core code?

Read more here: Woocommerce checkout only refresh on postcode

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