Breaking HDCP is a lot easier than breaking the other things. You don't have to attack the torment nexus directly. This is not the most ideal option but it is information theoretically correct assuming your capture rig is set up properly.

Yeah. The HDCP1 master key was leaked over a decade ago, it's a joke compared to widevine. Encoding the raw input is very feasible on modern hardware.

It would be harder to break HDCP and you wouldn't even get the original compressed media content. It's a worse idea.