I’m not sure if this has already been brought up, but Denis Lawson actually reprised his role as Wedge for the video game Rogue Squadron 2. It might be difficult to source high quality sound clips (what with the GameCube using those ridiculous “not-MiniDiscs”), but if you can find them they might come in handy for extra dialogue in the extended Battle of Endor.
Here’s a clip from RS2: https://www.youtube.com/watch?v=mDoApxyXwj0
Keep in mind Wedge is featured in pretty much every level so there’s a wealth of material available.
EDIT: I’ve realised that clip only has, like, one line from Wedge. Nevermind, you get the idea.