Sometimes I just don't know what's going through my head when I post something like the above. I think I had in my head that your issue was similar to when the front derailler can't move in far enough to clear the chain on the inner ring and big cog. But, as you've so patiently pointed out to me, it's definitely not. Sorry for the confusion.

So, we're back to changing the chain and derailler or moving to a different crankset. Given that yours is a rare issue, I'd be inclined to recommend just about any modern crankset as a solution to your problem. I've never had an issue with the derailler hitting the crank and I've installed quite a few different cranks though none of them Campy. If there was an issue like yours with the modern cranks, I'm sure we'd hear a lot more about it on these forums.