Tekken 5 video, made with Action Replay codes. So yes, I finally figured out how to do this. This seems to be strictly limited to swapping the opposing character (trying to swap the player character just makes it skip the cut-scene), but it's better than nothing. Also, I had far fewer lines to work with than I normally do with the Soul Calibur III videos, so don't expect all the dialogue to make perfect sense. Oh, and thanks to the letterbox format of Tekken 5's cut-scenes, the video is an absolute cropping disaster.
Tekken 5 is owned by Bandai Namco Games Inc.