If you want to load in the light, you could try Ilford SFX 200. It isn't a true infrared film but it's a near-infrared film that can provide a lot of the same effects.
If you want to use a rangefinder with IR film the easiest bet might be to get an old Russian one with a removable back. Either that, or practice loading your camera in the dark or in a changing bag until you get the hang of doing it without seeing what you are doing.
I agree that using a RF camera with IR film is about the most optimal way to do it. You can use an opaque infrared filter and it won't interfere with your viewing of the subject at all since you're not actually looking through the camera lens.