The Maul scene was confusing even to those who had seen the shows. It’s just such a bizarre inclusion that doesn’t really have anywhere to go.
And how would this change be accomplished, practically speaking?
Like I said, just have Sidious call him Darth Something at some point and that’s it. It’s not complicated, really. The line could replace “I made Snoke”. Something like “Darth Rifficus served his purpose.” Just need a good impressionist or some lines we can take from elsewhere. There’s no shortage of Palpatine saying the word Darth. Hell, you could even just have him say “I made Darth Snoke”.