Too bad PC's don't come with serial ports anymore. I know exactly what your problem is. It happens to me a few times a year that I have to drag the KV combo to my server rack at home. The last time because I accidentally issued this stupid command in the wrong terminal window on the DHCP server itself:
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That precludes any use of SSH, really.
I have been considering to install a known good VM host and never touch it, while installing my regular server on top of that. I think it would avoid 80% of dragging around the keyboard and monitor. It does not solve all problems, though. Booting the VM host and having a kernel panic due to an inaccessible hard drive and such. Upgrading the VM host while hosting a live system is obviously discouraged. And I don't know what the performance penalty would be.
jlinkels