I’d be highly against that. This is the ending. It’s the moment to introduce the idea of using the Dark Side for good. Killing Palpatine is the moment the good guys win, so you don’t want to have moral ambiguity there.
Seems to me the fact that it’s the ending of the Skywalker saga is the very reason not to introduce “using the Dark Side for good.” I’d be okay with that concept in and of itself; it was explored in the New Jedi Order storyline - but there it was developed over the course of several novels. I can’t see that working within a single film.