Decide whether you need a person at all
A person is for judgement, not for checking patterns. If the question is whether a key is in the code or a statistic has a source, a check answers it for free.
Commission a review when the question is whether the argument holds, whether the tone fits, whether a regulated claim is defensible, or whether somebody senior would put their name on it.
That framing also controls cost. Review hours spent on mechanical defects are hours not spent on the parts only a specialist can see.