I'm fine with both having one difficulty or two, but tasking it to one person, really.
The reason why I would go against it, is: Nifflas created 2 versions because he wanted people to offer the Knytt experience, or give them a bit of a challenge depending on what they wanted. Given that we are so many years ahead now, if people want the knytt experience, there are loads of levels that would do it for them, to which I'd say, we could get away with only the hard difficulty. It being the alternate dimension, it would totally be okay too.
But this thought also came from the moment when this project hadn't yet taken of at the speed it currently is travelling. Designing 2 areas is more work than doing one, which is why I initially thought we should just do one, so the project has a chance to succeed.
Given that the offer is now: one person does it after all areas are completed to balance things out, that would basically mean: we do a 2nd difficulty once the project already is near completion, so if for some reason no one wants to do that part, we still have a functional level.