Digital BW, The Print

I have an unused slot (PK) in my 4000 (dual quad piezo k7and CS) that  
currently just has a flush cart installed.  I thought about getting a  
cart of the Nanochrome black ink and using it in the PK slot for  
trying some BO printing on semimatte.  Has anyone tried this?  I saw  
no mention on the IV website about how they have their 220 ml black  
carts chipped (PK or MK).  Supposedly this is a universal black, but  
I would need a PK chipped cart of ink.