In general, anyone entering Ireland with a US licence is entitled to drive in Ireland for 1 year on it. If they remain in Ireland for more than one year, then they must get an Irish (or in theory any EU) licence. Their US licence is no longer valid for driving in Ireland.
I'm assuming you returned to Ireland after living in the US for a while and doing the test there, and that your residence is now in Ireland. If you returned more than one year ago, then your US licence is no longer valid. If you send the Gardai details of this, they could charge you with driving a vehicle without a valid licence - much more serious than taking 2 points.
IMHO better to accept the two points than risk getting done for a more serious offence.