Further thoughts on changing The Force Awakens to serve TLJ, I could place some of the footage of the Raddus going to hyperspace into the destruction of the Hosnian system.
It might be going too far to show Holdo staring out of the window at the approaching lasers, but even placing the TLJ ships in the distance going to hyperspace in this shot would help.
If we see Holdo in this sequence, then the only dialogue necessary for the previous scene would be ‘General, the Republic is scrambling the fleet to assist us’.