Hi WLD! I do this, played on the mandolin. I don't worry about the PC stuff; the whole point of the song is about what the PC conscious are trying (and failing) to achieve by bowdlerising the language; equality of opportunity and respect for humanity irrespective of race, colour, creed etc. etc. Using 'nigger' gives the song part of its power, as the shock value for modern audiences shakes the complacency that PC language has brought. The credo seems to be 'as long as we don't say the wrong thing, wrong things don't exist'. Taint necessarily so...
Tim