Unfortunately the specific country shipping rules are managed directly by Shopify and the are trying to hide or show different input fields based on the Country Region where the products are shipped.
But eventually not all country specific rules are implemented. So, considering that you are on Shopify Plus, I’d suggest first to contact your Shopify Plus Merchant Manager or Shopify Plus Support and explain the problem you are facing, maybe they have some good suggestions for this scenario.
Other then that, I see that for Kuwait Shopify is asking for Postal Code / Zip Code. Do you know if there is a specific validation for that field done by Shopify or if instead you can write anything there and it is accepted?
If you can write anything, an idea is to rename Postal Code to PACI Number when the shipping country Kuwait is selected. And this can be done with Custom JS on your checkout.
Sorry but I don’t have previous experience with Kuwait shipping practice.