Congrats on your relationship with Monique. I'm glad your cloud turned out to have a silver lining.
What I learned from your video was the part about the Super-yacht getting the stricken vessel's agreement to be liable for any damages before engaging in a tow or rescue. Noted also was that the commercial ship would only agree to take the crew off. Given that perspective you really got screwed for being a "nice guy". You were obligated to assist, but not required to put your self or your own vessel at risk. I probably would have done the same as you, but after watching your video maybe not.
Reflecting on your experience, with respect to aiding Cha-Cha would you have done things differently in hind-sight? I was thinking it would be good to sleep longer and rely on them to be the look-out and wake you via VHF call (day or night, if conditions were calm and clear). In hind-sight should you have disengaged the tow sooner or prior to nightfall, when conditions became rougher?
As for your request for editing advice, I thought you did quite well. Some of the transitions were a bit awkward -- for instance when you reached up to shut off the camera I thought you could have transitioned to a different scene before reaching, or when moving between deck and cockpit, you might have cut out the transition while walking through the curtain.
BTW -- some other questions about the enclosed cockpit: If your cockpit had been open to the weather (and you had more sensory input) do you think you would have been been surprised by the squall or as likely to have been overpowered and accidentally gybed? Is it possible the cockpit enclosure is interfering with the wind reaching your windvane? (Did you ever get that working?)