Keyboard on the steering wheel is s big NO in my book. If the airbag is deployed normally you will most likely end up with a concussion, but you will be alive. It would be sad to die with a big imprint of the ESCAPE key on your forehead.
Placing bigger bumpers to prevent the airbag from going off is a big NO as well. Proper installed bigger bumpers will have no impact on the airbag.
If you have this view, why not take the airbag out and place the keyboard in that space?