I disliked using a D850 and a Z camera. I remember shooting with the Z6 and the D850 at an event and being excited about how good the exposures look through the viewfinder. Then I realized I was shooting the D850 and it didn't have an EVF.
AF area modes are quite different even with those two cameras - and the Z7ii more different. For me, it's more important to have similar controls that I can quickly adjust. It takes a lot of concentration to use different camera models - and different brands and models would need serious practice.
I'd consider the combination short term for some specific needs. The The Z7ii would be fine for almost everything. I wonder if you would miss more shots with setting changes and lack of familiarity than camera performance differences?