Ask HN: Best screenshot tricking tool for Windows?

I am on Windows 10. My employer wants to monitor employee's work stations. It's creepy. I can't deny it. Is there a way I can trick the tool into sending custom images as screenshots? I tried Screenwings but it shows only a black screen which my employer will easily detect. Is there a way to override Windows' screenshot API to send custom images etc? How to start writing such a tool? ( If someone helps me get started, I will try to write such a tool)

Thank you so much!