The only existing alternate scene that I know of is the other title sequence. Over the same shots of Barbarella's zero-gravity striptease, there were differently animated titles that covered up more of Jane Fonda's nakedness. Originally the US version had less nudity, but the current DVD master uses the more revealing version.
ALPHA 7 SPACE-DOCK
THE OTHER DILDANO
Barbarella saluting. When she salutes the Earth President in the film, Barbarella is naked and facing the President on the viewscreen of the statue, here behind her.
So who is she saluting? Is this just a rehearsal?
There are no exterior shots in the film.