I own PSR9000 and VA7. And I use both as two-manual superarranger. You can do the same thing with KN7000 and VA7.
Simply stack it on 2-shelves stand one on top of another and connect VA-7 output with effect loop input of another kbd. You can add midi connection from VA-7 to another kbd -- solely to match pads (and this requiring tweaking midi profiles).
Then you have 2-manual superkbd with great style morphing and varyphrase from VA-7 and solo voices and pads from other kbd -- ready for live performance. And no computers and SD cards