Yeah, you're up a creek without a paddle there buddy.
It'll be marginally better than a 120mm AIO.
Reasoning: even a RAD with no fans at all is able to dissipate heat, like them totally silent PC's and all that...
Obviously fans go with radiators, like peas and carrots, but in your situation, the heart is willing, but the space inside that NZXT mini-ITX is not.
There are of course other ways. Look at my PC...marvel...and learn...young padawan.