Out of Options?
I use an older Lenovo B50-80 on Windows 8.1 and no graphics card. Only system I know I can still use.
Try a BenQ low end monitor that only displays sRGB. No HDR etc…. I believe they use LG panels and not Samsung along with their own display tech. They are not super bright monitors allowing you to use them at or near full brightness without issue therefore using little to no additional flicker.
i got this one https://www.amazon.com/gp/product/B0C7V9N88P
Speaking of kvm switch^
Someone else I remember either posting here or on the telegram said a dell dock which has a HDMI port also made things more comfortable