The only route open to you is to take legal action which would be slow and expensive.
In essence if Kildare Co Co fail to take enforcement action you must bring an action against the Council for not performing their statutory functions under the planning acts.
If you think writing a letter to Kildare County Council and waiting for them to take effective enforcement action will deliver a result then you probably are wasting your time; however if you raise the stakes you will get action but it will take time and will cost a lot of money.