iirc they came with an upper half fairing correct? so you switched out the fairing/headlight assembly for a different headlight, and new bars? cant get any more naked than that.
and fyi, "street fighter" is generally used in reference to stripping down a faired bike, hence my confusion with the fz1 since the bike is pretty much already there in stock form (just like the 919).
you could always look into re-routing the wires/cables to inside the bars for a cleaner look, better turn signals/lighting, crash bars/frame sliders, and aftermarket rearsets.
your other option is to start powder coating stuff. be careful here i advise you, this can get VERY addicting and is hard to stop lol.