Here’s an idea: replace Scabior with Barty Crouch Jr… Just deepfake David Tennant’s face over Nick Moran’s and voila! Doesn’t change much, I know, but it could help tie the films together.
You overestimate current deepfake technology.
Not to mention that the two characters are vastly different in terms of the roles they play and their rankings amongst the death eaters. They also sound nothing alike.