Snoke’s character and dialogue will be largely rewritten by dubbing his audio in an alien language, accompanied by new subtitles. He will be reframed from the outset as an intermediary for Sidious, a straightforward dark-side disciple who did not train Ren, & whose origins and abilities are not important (it’s easy enough to imagine he played a role similar to the purple-robed advisers we see in ROTJ). His new dialogue will also be a tool for enforcing some of the other changes to the story.
Why not just cut up audio clips of Snoke speaking and re-arrange them to make new dialogue, like how the “Despacito 2” parody video remixed existing audio clips from Despacito? (Yeah, I know that it’d sound a little choppy and sometimes robotic, but at least it’d be close to what Snoke’s voice sounds like)