How to disable dGPU (Nvidia) on Z490 hardware?

I have a MSI MEG Unify Z490i, i9-10850k with a GTX 1070 and want to be able to run on the Intel iGPU when in macOS. Since the hardware config seems to require something like iMac 20,2 I can't get it to ignore the dGPU and boot solely off the iGPU. Is this possible with Comet Lake hardware?

On a related note, is there any more info about Big Navi in Big Sur's latest beta 5 update? I'm eyeing the AMD RX 6800 but don't want to go for it until I know there's driver support (not that I can actually find one for MSRP).

submitted by /u/yeahgoestheusername
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