I still can't see where ======= can be dealt with in an alphabetic index. I mean, would it come before or after ********? I'm not being sarcastic here, aside from that kind of practical problem, it seems a sensible way of dealing with a song where a key word varies a lot, .
That being said, I'd have serious objections to anyone trying to take the "croppies" out of a song like "croppies lie down" or the "papishes" or the "papists" out of other songs of the same ilk. Though before I'd accept anyone singing them in my presence without objection, I'd want to know they were singing them as historical documents, and not because they agreed with the sentiments.
Sanitising the past is in a way a betrayal of the people who were oppressed ad insulted in the past. The way I feel uneasy when I see cleaned-up "period" drama in which it is pretended that, for example the American West was free from racism. It reduces the pain, but it also reduces the heroism of those who resisted it, even maybe without knowing why, the real life Huckleberry Finns.