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I believe that the FAQ here: https://uk.usembassy.gov/information-for-nonimmigrant-visa-applicants-following-the-coronavirus-covid-19-outbreak/ answers my question.
Can I travel to the United States through a country that is not covered by Presidential Proclamation 9996?
Travel to the United States from a country that is not covered by the Presidential Proclamation may be possible, but we advise you to verify whether the country to which you intend to travel has implemented travel or other restrictions before you make travel arrangements.β― One possible source of such information is travel.state.gov which contains links to the websites of other countriesβ immigration authorities.