I noticed it, but I don’t think the klaxon delay is a bad thing. I think having the menacing music start in that scene works, but like I mentioned before, maybe have it cut out temporarily during the head-turn shot, and see how that feels.
This might be a stretch, but I wonder if something could possibly be put together using Unreal Engine. Using the Phasma model from battlefront, and some kind of console model, you could make a quick insert shot of her pressing a button. Having her activate a silent alarm would make her seem even more intelligent than just sounding a regular alarm, and it might be clearer that it was intentional rather than just a side effect of the shields going down.
Obviously that might be difficult but it might be worth trying. Something like a button underneath the main console, or even a button on the top that blinks after she presses it or something. Hmm, I might do more research on this.
I think not having the klaxons blare during that scene though for the sake of the dialogue being clear is a good reason. And if you don’t think “Lower the shields” would work I don’t think it is a deal breaker. The shields being lowered seems to be implied by the screen behind her anyway.
JEDIT: I think redubbing is a great idea! I think offscreen dialogue is my go-to plan for a lot of my ideas too!! And it’d be a lot easier than animating something.
The trickiest thing, whether an insert shot or the Hux update idea, would be to make it clear that Phasma is relaying more information with the silent alarm than would potentially be gleaned from just the shield going down.
Considering Hux being updated with some information, maybe this sequence of events:
Finn: ‘Solo, if this works, we’re not gonna have a lot of time to find Rey.’
Han: ‘Don’t worry kid, we won’t leave without her.’
Officer: ‘Sir!’
Hux: ‘Report’
Officer: ‘Receiving an order for all troops to block 24.’
Phasma: ‘You can’t be so stupid as to think this will be easy. My troops will storm this block and kill you all.’
Then have the garbage chute, Kylo update, and start of the alarm.
Additionally, removing the 15 minute ticking clock makes me happy because it was so transparently impossible for even the events of the original film to happen in such a timeframe.