As I recall, VHS has a lower resolution than DVD, partly interlacing and partly lower horizontal resolution. That can make it even harder to fake. Have you seen Kill Bill? Tarentino uses an anime-style section to tell part of the story. So, do you need to do a convincing fake, or can you tell the story differently? For instance, a character sees them after the fight, and what we see is the CGI of what he imagines happened.