Stranger Things Live Action Spinoff Idea
I think the spinoff should/could take place during the 1960s in the Space Race era where we would get to see the Duffer Brothers version of aliens and UFO's from space. They could also take inspiration from ancient aliens theories and conspiracies of that time.
Of course, it would all be done in the Duffer Brothers signature twist of subverting expectations, which includes typical expectations of UFO and alien phenomena. And tie it all together in a way that makes sense.
I know some fans might be against this and think this would have nothing to do with Stranger Things, it actually does but just not with the original show. The Duffers have said that their new spinoff would be different from original series with a new plot and characters. And they would make really good use of the title of the brand "Stranger Things" stranger things have happened in the world.