I’d agree that deepfaking fake wedge would be great, though I’m not familiar enough with the process to know how much work that would be. I’ve seen a lot of impressive deepfake videos but most still have noticeable artifacting, so I would only say it would be good if it can be done to a certain level of quality.
Honestly, getting a guy to dub the one line might be best. Microphones and mixing can get a voice to blend pretty well into the 5.1 mix.