One thing is almost uncensored - these are commercials. How about making commercials with aliens playing as actors? The commercials don't have to advertise you. They can advertise some boring goods, like drinks, but having real aliens and hybrids as actors would give a great exposure of humans to the aliens. Technically it is possible. How damaging this will be can be judged by experimentation on small scale.
ALIENS IN MOVIES You are not ready for making full length human movies and for volunteering as actors in human movies. But you can help designers with visual materials and supply the movie creators with information. Of course you want to be depicted positively, as in Spielberg's movies.