Remote access from hardware level

Hi. I'm trying to implement the following.

There are two computers, A that is in remote location and B that is with me. I want to be able to access computer A from computer B with the following conditions:

1. I should be able to use mouse and keyboard of the remote computer A.
2. I should be able to see the screen of remote computer A.
3. I should be able to do audio calls in the remote computer A.
Optional: I should be able to do video calls in the remote computer A.

All of the above actions should be doable from computer B.

I'm looking for a hardware based solution instead of a software solution because I might not have all the permissions to install a software on remote computer A. Some options I looked into are:

- KVM
- A combination of teamviewer and raspberry pi

This solution should be working real time with minimum lag. Welcoming creative ideas.

Thanks.