Kind of a clunky idea, but here goes.

Get a numeric keypad, and pop off every other button cap. Map the remaining keys to whatever actions you want to control on the computer. Tape the keypad to the window on your hood, perhaps with blue masking tape (removes cleanly). Hit the buttons with your nose.

On Windows, I would get all the files opened, and have a key for Alt-Tab, and then keys for left, right, up and down.

Good Luck!