How to connect a DJM-900Nxs2 to a DDJ-RZ controller

Hi there,

I know it sounds a bit strange but I want to hook up a DJM 900nxs2 to a DDJ-RZ controller with the purpose of combining the mixer functions of the DJM with the deck players of the DDJ when using Rekordbox Performance. Any suggestions to make this possible?

Much appreciated.