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Re:HDMI Firewall by mintplant on Tuesday June 21, 2022 @05:37PM (#31829393)
There's also Monitorian for Windows: https://github.com/emoacht/Monitorian
Re:HDMI Firewall by jorvi on Tuesday June 21, 2022 @09:03PM (#31830905)
And for a more advanced feature set, ClickMonitorDDC.

Sadly it is no longer hosted by the company where the developer worked. I mailed them, asking where the dev went or if they could put me in contact with him so he could release the source code. Regretfully I never got a response.