Nope. The correct way to do this is:
- With a proper IP KVM. These are expensive for a reason: only people with a lot of money need them. That's basically it - supply, demand and target market.
- With remote desktop (Windows) or VNC (any OS with a GUI) or SSH (for command-line *nix). You've already mentioned you can't to this because you want this to work above the operating system.
- With out-of-band management. For desktop PCs, there is Intel vPro and for servers there's IPMI and their various IP-based KVM's that are built into the OOB management.