I don’t know if it’ll work, but try shooting it under normal conditions and in post, drop the brightness, raise the contrast, and increase the blue saturation. It should look night-like but still maintain the highlight details. I don’t know if it’ll work, but if it does, let me know.
I have a problem when shooting day for night: it shows too much background. If you have an exterior scene, you can see everything in the background. At night, visual perception decreases with distance (assuming no exterior light - and then those show up as pools in the blackness), it does not maintain a constant low level as far as you can see.
May I ask why are you shooting DFN anyway? Why not just shoot at night with lights? Of course, I may have answered my own question because those big lights can cost a lot, but I was just wondering.