Just found something of a workaround and thought I'd share it here for everyone's benefit. It does the job partly. Follow the steps in the linked article and use the Windows Magnifier to invert all screen colors: www.businessinsider.com/how-to-invert-colors-on-windows
I played around with the envrionment settings and I got the following options:
1. Completely black background with high contrast white model:
Set Environment to "Infinity Pool" and turn off the Ground Plane. See image:
Env: Infinity Pool, Ground Plane OFF
2. Shaded background for better depth perception:
Set Environment to "Infinity Pool" and turn on the Ground Plane. See image:
Env: Infinity Pool, Ground Plane ON
For some reason the "Photo Booth" environment makes the model and grid darker and doesn't contrast as well. The model shown above uses the default Steel appearance. Hope this helps till we get an official Dark Mode! 😄