I really don't think that having yet another process to skip the code review is the way to make it easier to use. Besides, the tooling won't support opposite workflows so this will have to be hacked in somehow (typical git commit hooks that randomly block commits with no explanation unless they have a magic word in the message).

If their team is small (less than 5 developers), don't make code review a hard blocker, there's never anybody available to code review.