Just find a matching 3rensho chromed (since yellow's a tad hard to come by), and stay with that if you want classic. I wouldn't stick anything carbon on it to violate that "classic" feel. An aero bladed fork would look nice as well, just find a chromed one.
This is why I won't buy NJS frames w out a fork, but to expand a bit further past aesthetics, NJS frames have that famous nervous geometry, and that's part of what you pay for. Unless I have a build sheet with AtoC and rake measurements, I don't want to even mess with putting a new fork on an NJS frame and risk compromising the designed geometry.