Switching working nVidia installation to iGPU and updating macOS

I currently have a working High Sierra vanilla installation with a GTX 1070 graphics card. However, my job requires that I use the latest version of flutter which requires xcode 11. Unfortunately, High Sierra doesn't support any higher than 10, so I've decided to switch to using the iGPU for my hackintosh and update to the latest macOS version, and I'm having some trouble modifying my installation to allow that.

Firstly, I'm not sure what needs to change in the config.plist to switch from using an nVidia card to the onboard graphics. Also, am I able just modify the EFI partition of the already installed OS, or do I have to modify the installation media and reinstall?

Sorry, kind of a noob at this.

My hardware:

AsRock z370m pro4

Intel i7 8700

Zotac GTX 1070

submitted by /u/rtybanana
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