What about buying a commercial display panel?
https://www.mwave.com.au/product/lg-se3kdb-49-full-hd-ips-le...
Some of these things look like they have API and what not, so maybe they allow you to turn off all the things you don't want?
https://www.mwave.com.au/product/lg-se3kdb-49-full-hd-ips-le...
Some of these things look like they have API and what not, so maybe they allow you to turn off all the things you don't want?