Offaly,
You have the right idea. The Irish Consulate can issue you a passport right away as long as you have an Irish BC. You can sort the US and red tape out when you return, at your leisure.
When I was in the UK, I had my passport, cash, traveller's checks, American Express card and the rest of my wallet to include any picture ID I had stolen. I was left with no ID and no money. I went to the US Consolate and had my passport re-issued that day. I had to have another American student that I knew for two months say she knew me for at least three years, and swear both our lives away, but I walked out with a passport. I couldn't even go re-claim the few traveller's checks I was owed until this happened because I had no ID...talk about feeling without identity.