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I don't know anything about a Nikon Z6, but Google tells me it has a mechanical (rather than electricial) aperture. If it were electrical like Canon, you would probably be sunk with no option to control aperture unless somebody has produced some adapter with electronics in it..
I have Sony A-Mount lenses which also have a mechanical aperture. When the lens is removed from the camera, the aperture closes. It is spring loaded. If you look at the rear of the lens there is a little lever you can push to adjust aperture. I expect Z-mount lenses to be similar. Just shine a led torch down the front of the lens to confirm the aperture is closed off camera.
That means it should possible to make a purely mechanical adapter with aperture adjustment. Maybe such an adapter is available if the flange/sensor distance is large enough (may be an issue on mirrorless cameras). I have made a 3D printed one for A-mount by adapting a design from Thingiverse. Printed in PETG-CF. Yet to see how well it works in practice, but the aperture ring on the adapter works fine.
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