I've been thinking about your perf idea and was thinking plexi would be ideal for this. Make it so you thread the film through a 'box'* get a tiny rollerball spring catch to use as a registration stop. Polish everything nice and smooth. Then a person could complete the process in a dark bag. Would limit handling the film too much. The tweaking would be in finding a stop that would work for registration.
* two parallel sheets separated by 1/32nd spacer guides.