It’s not something that registered to me as a major issue that needs fixing, and I don’t have any knowledge about how to do it, but I’d incorporate clean alternate voice lines if anyone did the work to produce them.
The reason I was hoping it was possible was because Tim curry feels badly miscasted as palpatine his tone is right but the voice takes me out because I don’t hear palpatine I hear Tim curry.
I get it; I just never registered it as being too noticeably different myself. It’s not something I have the skills for, but as I say, I’m happy to include it if given replacement lines.