- Install Karabiner-Elements https://pqrs.org/osx/karabiner/
- Save this as your ~/.config/karabiner/karabiner.json
- Launch Karabiner-Elements
- You will have a profile called Cat Mode which disables all keys except the power button
There is a github repo which was a Karabiner extension I borrowed some inspiration from. I'll link to it if I find it again.