If we add a vision at the beginning of the opening, I believe it should be quieter. Jumping straight from a flashy vision to the middle of an action scene wouldn’t really fix the whiplash effect and abysmal pacing. Yeah the vision could contextualize the later scene better, but maybe we could insert slower establishing shots of Exegol/Mustafar/the Sith fleet/whatever to fill space between the quicker frames of Han, Luke, etc. and let the vision have more breathing room, before moving on to Kylo’s battle with the cultists.
I like DZ-330 restructure, and I don’t mind ditching a cold opening in favor of a fast, Bond-style action sequence. I’d rather not have Kylo and Vader’s helmet interspersed with Rey’s training, so we can keep those shots for later and justify Kylo reforging his helmet as in DominicCobb’s version. Rey’s flashbacks should be a side-consequence of her gradually losing her temper, thus showing her struggles with the dark side early in the film. Also, that way, we can reveal Kylo’s face on Mustafar.
As a minor fuss, if we open the film with the Falcon action scene, the moment where the TIEs arrive should be rescored. Emperor Palpatine’s theme doesn’t feel right when we haven’t seen him yet at this point or known of his connections to the First Order.