HeNe lasers are (according to Wikipedia) 632.8nm. They've got a ridiculously
narrow bandwidth too.
That doesn't explicitly mean that the film will also have a ridiculously narrow bandwidth, but it probably peaks in that area and doesn't have much either side in the traditional sense.
Could make for some very interesting shots, much like using strong red filter.
If you use it, post some here, if you don't, post it to me
No idea about exposure though, most of those graphics-arts / ortho / line films start around EI6, so that's probably a place to start. You'll have to just experiment and bracket a lot, your results are going to vary greatly depending on how much red is in the scene.