Have a look at https://github.com/DisplayLink/evdi and (shameless plug, toy proj...

		mlukaszek 8 months ago \| parent \| context \| favorite \| on: Modifying an HDMI dummy plug's EDID using a Raspbe... Have a look at https://github.com/DisplayLink/evdi and (shameless plug, toy project, be gentle) https://github.com/mlukaszek/evdipp