I fully endorse the idea of Peter Mayhew having a recognizable cameo in the upcoming Han Solo based movie. It would be as rewarding for the fans and undoubtedly for Mr. Mayhew himself, who deserves so much for bringing years of entertainment and joy to fans-for being a consummate Star Wars ambassador and for bringing to life the incomparable Chewbacca in the way only he could.
I think this is a great idea, and it would be good for Peter. Lou Ferrigno has had appearances in the new Incredible Hulk movies, so why not actors & actresses from the original Star Wars? Like I said I would watch the movie just to see Peter in it. :)