My personal view is that for Etudes in particular, the whole point is to study it as written by the composer, to study playing a particular technical pattern with comfort and ease. If you "cheat", you cheat yourself out of a valuable lesson. I'd also argue, if you need to cheat to play the piece well in front of an audience, have you really mastered the technique?
However, at the same time, I think you can do whatever you want when performing it, because all that matters in a performance is that it sounds awesome and that it is a great experience for both the audience and the performer. Your playing of the piece is certainly very enjoyable
