The SPINN CP.02 camera carry system strap already raised over $155k on Kickstarter and is ending today:
The system is compatible with the following Nikon cameras: Z5 / Z6 / Z6 Mk II / Z7 / Z7 Mk II / Z50 / D40 / D300 / D500 / D750 / D780 / D800 / D850 / D3300 / D3500 / D5200 / D5600 / D7500.
More information is available here.