Thanks for the sensitivity and explanation for the theme.
Words evolve and grow with connotations. Twain's use of the "N" word was appropriate for the time, and altering it rewrites his words, and dismisses the culture (or lack of) in which the word was used. It is a teaching/learning opportunity.
Adjusting connotations and definitions to fit the times is considerate and sensitive; but the "baggage" and "issues" words carry from their past, need to be respected.
The best way to alter the past is to adjust to it, and practice from its lessons.