Built a nice little PiKVM and deployed it in my NAS. The NAS is heavy and placed in a dark half-height place under the stairs so it’s awkward when things go wrong and you need hardware access.
For those that don’t know what PiKVM is: https://pikvm.org/
I was thinking more about the basics, like USB input and getting the image+sound. For that you could get away with a special USB cable and a capture card. I’m just not aware of any software for it, I don’t think the original PiKVM stuff was ever ported to PC.
PiKVM is based on Arch for ARM.