The idea of a personalized protagonist voice is interesting, but I'd worry about some kind of uncanny valley where it sounds like myself but is using the wrong word-choices or inflections.

Actually, getting it to sound "like myself" in the first place is an extra challenge! For many people even actual recordings sound "wrong", probably because your self-perception involves spoken sound being transmitted through your neck and head, with a different blend of frequencies.

After that is solved, there's still the problem of bystanders remarking: "Is that supposed to sound like you? It doesn't sound like you."