si_edgey For a laptop to support G-Sync, the display has to be connected to the Nvidia card directly. There's no other way. I've not heard of any laptop manufacturer claim "G-sync supported only if you connect it to a G-sync display!". No, they all carry a G-sync display as standard. Go to any G-sync laptop's drivers download page, you'll not find intel HD drivers on offer. Manufacture's use a combination of Intel HD and Nvidia to ensure power savings and long battery life. But with gaming laptops that support G-sync, power saving becomes an oxymoron, so intel HD is omitted completely.
You might want to talk to people who report eyestrain with Nvidia or AMD desktop cards and see how they have connected their displays. Most likely it will turn out that they have connected their monitors using the default VGA port which is handled by Intel HD and also they will have Intel HD drivers installed on their system.
For me a G-Sync laptop with PWM free display solved the problem completely, and I hope it helps others.