How to Disable Laptop Keyboard?

I have tried:

1. Install an incompatible driver - still works.
2. Disable it through DevManView - gives an error.
3. Uninstalling it - obviously does not work, it will reinstall upon restart.

I need it for 2 reasons: for my laptop, so I could put food on my laptop, without keys being pressed. And some kids spilled a juice on a laptop, which damaged it, but one key is being pressed, so I need to disable it to be able to use an external keyboard. I have cleaned the keys, it did not help. I hate MS for making simple things so difficult to do.

Unplugging the ribbon cable is one option? Carefully release the locking bar and it should slide out of the motherboard connecter on its own. Getting at the connector could be easy or quit hard. Depends on the laptop construction. Google keyboard replacement for your make model and you may get the info you need. I've taken regular keyboards and washed then in the kitchen sink with the spray nozzle. No soap, just hot water. Then set them out in the sunlight for a couple of days to be sure they are completely dry. It fixed the sticky keys on a few of them for me. They were never any worse than before I cleaned them. YMMV of coarse.

I don't know of any software way to do it. Other than maybe in device manager?

Thanks for the tips, but in the end, it was way simple than I have thought.
I just had to finish it or to choose the right wrong driver (Japanese).

1. Install an incompatible driver, anything will do.
2. Disable the device, once it is not a default MS driver, it can be easily disabled.