Are you using any HD footage that you can use for zoomed or alternative cropped shots that will not look the same(if you will use same/previous shots from previous movies)

Tried to contact with guys that made wookie costumes to film them in Green screen? or even in forests?

If you say that is an ambitious edit then aim high for more ambitious solutions like re filming. I think a fan film named tydirium made some shots in the endor like forest. you may want to take a look for ideas.

Also Clone wars season 2 have many many good shots of coruscant that feels more minimalistic and OT than the live action movie.

-Angel