I don’t think anyone else has looked into finding new sources of ADR lines for Dern or Fisher, at least in this particular way. Even if you can, you run into the problem of if the line will actually fit the tone and inflection that would be appropriate for the sentence you’re trying to construct.

Hmm. I wonder if one of the AI voice generators could be used to make a simple sentence. Understanding how to use that tech is beyond me, though.

It might not work as well, but Commander D’Arcy could be redubbed by another actress, since she is present in both scenes. In her speech she could say something about their possibly being a spy, so their plan must remain top secret. Then, in the transport, she could say how Holdo didn’t know about the hyperspace tracking.