How do I disable onboard laptop keyboard?

The Latitude CPi keyboard has gone haywire, and I want to completely disable or bypass it. There is no BIOS option, and the device does not show up in Device Manager. Apart from opening the case and manually disconnecting the keyboard, is there a way to stop the OS from registering keystrokes on the onboard kb?

Please do not suggest diagnostics and "fixing" options. I want the keyboard completely offline, so suggest how to do that, or tell me I need to crack it open.

Terry