I did this type of thing in the last millenium. Used Lith film for both interpositive and negative. Made the enlarged interpostive, then contact printed lith film interpositive to more lith film to get the enlarged negative. (Why lith film twice? My summer job was at an offset printing plant.)

Not only can you do a "straight" enlarged print this way, I used varying negatives to create posterizations and then converted the tones to color using colored filters and Beseler color printing tubes. Yes, tube processing in 1974!