Right, so you are shooting Double 8 and screen them as Normal 8. Yeah, I can see know why you are considering the Super 8 cartridge system as something else and distinct .
Nikon's only claim to fame comes from the Nikon R10 model. Don't bother with any other Nikon cameras. Back then, they were not nearly where they are today in terms of market dominance, tech leadership and brand premium.
There have been plenty of forum threads here discussing the pros and cons of the Nikon R10 camera. Search for them. Some former users and I spent long threads discussing the intricacies of the camera, and we deconstructed the myths surrounding it quite thoroughly.
Since then, I've personally never been convinced again by the acclaim that the Nikon R10 gets from its followers. My advice: Don't bother. And whatever anyone tells you, including published books by Jürgen Lossau, do not believe the legend that it is "pin registered". The Nikon R10 does not only have no registration pin, it also does not have a double registration pin, and it certainly does not have two double registration pins! The Nikon R10 is not a Mitchell S35!!
Beaulieu/Bauer/Nizo production cameras are always the better choice in terms of optics, features, reliability, and Canon is the better choice for 'Made in Japan' cameras of the era.