Supplying Northern Ireland but not the UK from Southern Ireland

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Has anyone found a way to supply the North of Ireland only and not the rest of the UK from a business based in Southern Ireland. My settings allow me to select different rates for all 26 counties in the South of Ireland but not to add the 6 from Northern Ireland. Surely Shopify should have this enabled? I do not wish to supply the rest of the UK and do not feel I should buy an external app to do this!

My courier company has the same price for shipping all over the island of Ireland.