A $25.00 investment will get a non eyeglass wearer the fov experience. I don't think 600' is necessary, although it sounds nice. 11* or 578' for a 77* afov in a vintage 7x35 porro will illustrate this. What happens with 75-80* afov is that the edge almost goes away. Yes, you can still have perceptual awareness that there is a black border out there at the edge of the earth. However, you can't really see it. When you try to actually look at the edge, you basically can't. If you go, say to the left edge, your right eye gets black out before you get there, if you force the issue and keep going you see two edges...which one is the real edge?
This does a couple of things. First it puts the pre edge image softness out into the periphery of the field, where it should be. In effect, you have a magnified peripheral view with much less edge awareness. The second thing it does is cause an apparent widening of the sweet spot. If you have eyes with some accommodation, they will focus out a lot of the gradual field curvature in the softness of the image. ETA: Combine the above with the 3-D effect of the porro gives a pretty outstanding view in many respects.
You will need a porro with large prisms, American style rather than the smaller German/Zeiss style. A smaller prism porro with a 578' fov does not give the same impression of width as the larger. For one thing, they have a little more eye relief and you have to back off a few mm to avoid blackout. The closer you can get your eye to the ocular the wider things look. The large prism UWA 7x35's are a large double handful of binocular, small they really are not.
Eye glass wearers are out of luck here, you can't get close enough to the ocular to even completely merge the images. They are not for cold weather either, because with your eyes that close to the lens, there is a lot of external fogging potential.
I have been thinking about what one of these would look like with modern glass and coatings. After reading Holger, I agree with him. Another eye piece is needed too.
So, I don't think SV/EDG type sharp edges are needed, but a lessening of the softness of the image and widening the sweet spot would be a view to be seen.
The old porro will perform at surprising levels, but an alpha they are not. They serve to illustrate the fov phenomena quite well.