Anyway: yes, if you 301 this page it won't be properly counted by Google Analytcs (GA from now on).
Solution: block your campaign URL's in the robots TXT. No link juice? Yes, no link juice. If anyone knows a way please post it.
BTW: they're not Google Banners, they're yours. You have control whether you want them to be indexed or not. Google has no right to decide it.