Greg;

If you are determined to take sequential separation negatives, registration becomes a real pain, but there is a way. You can get creative and cut the 3 negatives out, then register them with a rivet so that they swivel or rotate around the rivet. Then, by using a cardboard carrier, you can print them. But, they still may be out of alignment due to some of the movement.

All I can suggest is experiment.

PE