I think the whole point of a DSLR meter is that it gives you a histogram which gives you not just the middle gray, but tells you where the rest of the exposure values sit (highlights, shadows ...). In short, it is like a graphical zone meter. Using camera settings ("tone compensation" on nikon's for example) you can change the range of the histogram to match your film.
I think carrying two cameras is too much for me, but it would be a good product if some light meter company came out with a scene meter which replicated this functionality. With the cost of digital sensors right now, it should be an affordable item - but there are probably not enough buyers to earn back the development cost.
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