I had a look at the results for all Nicholas Murphy on the 1911 census and there are just over 100 - and that includes some from counties other than Dublin or Wexford, not as many as I thought there might be.
I am sure quite a few could be eliminated by age, and others by county of birth.. hopefully with the occupation, and his wifes name it might be possible to find a possible match..
just as long as he didnt live somewhere in between, like Wicklow, during 1911!
Shane