There is a new Nikon Z-mount to PL-mount lens adapter from Wooden Camera ($499):
Nikon Z Mount to PL Adapter Pro is a shimmable version of our PL lens mount adapter that enables mounting of PL mount lenses onto the Nikon Z series of Mirrorless cameras. Mount includes a foot with 1/4-20 threaded hole for attaching to a tripod eliminating strain on the camera. The foot can also attach directly to the front of the Unified DSLR Cage (Small) by two included screws. PL Cap is included to prevent dust from entering the sensor area when the lens is not attached.
If you are using the Nikon Z Mount to PL Mount Pro without a camera cage, you can use the included WC Lens Adapter Universal Support Foot to attach directly to the bottom of your camera and lens mount. This allows all the weight to be transferred from the lens mount to the bottom of the camera to avoid any flexing or damage that could occur when using heavier lenses.
Additional information is available here.
More lens adapters for Nikon Z-mount can be found here.
