Whoa, TIL! I love Christopher Nolan films. I'm guessing there might be an OSS toolkit or multimodal LLM able to do this kind of de/reconstruction with an avi or whatever file format.
Related tangent (creativity assoc w a Nolan film), one of my all-time favorite web pages is this interactive visualization of Inception^1 which makes the levels of dreaming and the related slowing of time intuitive. Sadly it's desktop-only, but well worth it.
Something like this for Tenet would be great. There are plenty of explainers, but not as well designed & interactive.
If you have the DVD, or have ripped it with chapter markings it would be super easy: you just need to change the chapters order, like in a playlist (that's basically what the original DVD did, IIRC)