We're talking about a 35 mm SLR resurrection, though, aren't we? You could mount a Minolta/Minox style horizontal guillotine shutter between film chambers at the focal plane, and have room for a mirror box and lens mount (you'd sell it with user-configurable lens mounts so the user could select, say, M42, Nikon F, Minolta or Yashica in the same pre-autofocus age range -- so long as you make the mirror box short enough to accommodate the shortest flange to film distance). You might need to make the camera a little wider than the more compact original cameras, but being able to make a shutter that doesn't require a mad clockmaker to assemble would make it worthwhile. This might even be possible to offer as a kit, similar in concept to the Konstructor from Lomography.
No, not two wings. Look at the shutters in Minolta 16, 16II, Kiev Vega, 30, and 303, or a Minox. Basically a focal plane shutter with solid metal curtains, except those cameras mount it in front of the lens, making it a guillotine type. I'm looking at a much simpler way to time the leaves, but you'd still have a separate aperture so your bokeh would be whatever the aperture created (if you build it to use existing lenses, you'd get the regular multi-leaf iris). I agree, the shutter/aperture combination with a square opening does create ugly bokeh, but this isn't that (that was an alternative, and would be much harder -- maybe impossible -- to implement without electronics).