You may have to spoof the IGPU. Similar process as for SSDT-DiscreteSpoof.aml, but using the IGPU ACPI path.
That will keep base graphics drivers from loading against the IGPU.
Try that next.
Then hopefully the base drivers will work for your Nvidia. Note that you will need to set config.plist/Graphics/Inject/NVidia=false (you currently have it true, which will inject spoof properties on Nvidia... look at Devices/AddProperties).
If the base drivers can't be used on the Nvidia, then you'll probably need to pre-install the Nvidia web drivers. Will require another computer, and some transplanting of the SSD back and forth between that computer and this one...