I know this is a joke, but I don't see why it couldn't work in-film, so long as they don't reference anything else. It'd be just like the Alien skull in Predator 2 - those who want to can take it as proof that the two universes are one, and those who don't can easily dismiss it as a reused prop design - after all, we don't think Firefly and Starship Troopers are part of the same universe, do we guys?
Guys?
...Oh, dead God, no.