Update
I got GPU switching by downloading and building this utility: https://gitlab.com/asus-linux/supergfxctl
It does not require a custom kernel. The author just uploaded it. There were a few dependency issues and the daemon did not automatically install. But the author helped me troubleshoot that stuff on Discord and we got it working.
He mentioned he plans to release it to various distros once it is tested a bit.
Upon switching to the NVIDIA dGPU, I found that I had the same issues driving my 4K monitor - twinkling pixels and the display blanking out every 10s or so. I solved this problem by dropping the frame rate from 60Hz to 30Hz. Not sure why this was happening or why dropping the frame rate fixed it. I was using a brand new HDMI cable and driving it (LG 43UD79) with its 60Hz HDMI port.
Anyway, I can now switch GPUs at will and once again use my large display.
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