These rearranging ideas all sound kind of fun on paper but I don’t think I’ve seen anything that works in practice.
I’m still of the belief that the way to save the trench run is simply to make it seem like the weapon is going to fire again, this time at the Resistance base.
Yeah, for every 5 ideas only one works out it seems.
But your idea might work. Although we can’t use any of the Resistance base scenes, it may be possible to cut together the unused Hux/Snoke dialogue. Since it would be extremely difficult to use the Resistance base dialogue on the subject, the implication would be that the fighters are just fulfilling their original objective, unaware that the station is able to fire again.