This is one of the classic uses of ortho film but even in the absence of it you can still contact print to a fine grain film of equal size (you'll pick up contrast) to make an inter-positive using an enlarger or other well balanced light source. You can then enlarge that to any other film size you want creating the final inter-negative. You'll have to work in the dark for the actual exposure phases and both the pos and neg will of course need their own processing before each step.