Piezo Pro without Black Switch

Hi there,

I am considering switching to Piezo Pro Inks and I am wondering if there is any contraindications installing Piezo Pro K4 inks on a 10 channels printers (with a remapping of the channels). This would permit to have Photo and Matte Black installed in parallel. This option is not proposed on the printer compatibility page, is there any reason for that?

Others questions :

-Is there a big quality jump between Piezo Pro K4 and K5?
-Is Piezo Pro K4 compatible with PiezoDN?