This interesting in that while there is already a Starnger Things TV to movie edit series, that one takes the opposite approach of cutting things until it fits in a movie runtime, while you opted to just make more movies. Are you only doing Season 1?
Terribly sorry for the late reply but I am planning on just doing season one. Tbh while I understand wanting to trim season one into a single movie, I speak from experience that the season is paced in a way that removing something would be like removing a puzzle piece.