I'm not aware of any reason why you couldn't use any RBA on the KBox Mini. The only possible issue might be the fixed 510 center pin on the KBox not allowing all juice attachments to connect perfectly.
I'm a little confused though by your question. I'm not aware of a specific juice attachment that is made by Nemesis. Best to my knowledge, a Nemesis is just a mechanical mod.
Just make sure you are using one of the better 20 amp continuous batteries from the likes of Lg, samsung, or sony.