I think you should just give this a try with whatever film and equipment you have. If you can bulk load film, you could make some short rolls for this project. Maybe shoot 3 nights at different exposure times and see what you get. Perhaps one, two and four hours at smallest aperture. I wouldn't worry too much about reciprocity effect as you're looking for a certain effect, rather than a perfect exposure. Orange streetlights may well be sodium lamps which might not have much effect on the overall exposure, dependant on their spectral output. Experimentation will tell. The one thing which could cause over exposure would, of course, be the sun coming up. I would aim to end your exposures long before that happens to be safe. I should have said that with making short loads of 35mm film I'm not suggesting only 3 frames per roll. I would think that 12 would be a sensible minimum for easy loading in a tank, and even development. With the F3, a long cable release and the 'B' setting may be your only route. I think you can get remote control equipment for it, but it works with the motor drive, and not the camera alone. For the F100 and some other AF models with the right socket you get a fairly inexpensive remote release that does timed exposures up to several hours. I presume you're going to use some sort of alarm to wake you in time to end the exposure? The most difficult bit might be falling asleep when you know you're being filmed!! Good luck with your project.
Alex.