Both those ideas could work. Does the Abednego Poe asks about Holdo have any lines? I seem to remember him saying something to Poe, but the screenplay doesn’t have him speak. If so, he’d be easy to dub over, saying something to Poe.
I still think it’s worth watching some Laura Dern movies and seeing if there’s anything useful. I like Laura Dern as an actor so I don’t mind watching a couple movies from her filmography that seem likely to have comments about spies in them.
Even if I found something perfect, it would only strengthen it to do the other suggested changes with the supporting characters as well.