I personally vote a hard NO on adding Han’s voice or anything else specific.
The arguments that are being used are essentially saying Luke saw specific actions on Ben’s part. But … there is no indication at all in the scene that Luke foresaw specific things Ben would do, like destroy his fellow padawans or slay Han. It was about WHAT he was becoming and WHAT he will bring.
Trying to link Luke’s reaction, exile, etc. to what he saw AND his decision afterwards is stretching it too much and will cause more confusion than answers (If he saw him killing his other students, why not still act if he farsaw him KILLING A BUNCH OF PEOPLE SOONISH? Foresaw Han getting killed, why not reach out to Han and Leia … or even try again with Ben however he could, etc. etc.)
See? It’s causing more problems than fixing it. Keeping it vague and more about WHAT he was coming, as the scene does, is the better option.
I get both sides of the Luke portrayal in TLJ and people can debate on what’s right and wrong about it, but quite frankly, both sides are right. (See what I did there 😃)
So keeping it as abstract as possible and not trying to connect it to any specific moments is best.