They definitely needed "Blue Harvest" on location. I'm not sure how an alternate title with Jedi in it was going to fake anyone out. And it's a little hard to hide the fact a Star Wars film was being made at Elstree anyway.

If one believes the tale of phony script pages given to people deemed a security risk, an alternate title isn't going to help or hinder much.

I'm trying to recall if any Kenner toys hit the shelves with the Revenge logo. I do recall the mail away offer for Admiral Ackbar being a character from Revenge.