Well, thankfully for you, there is no actual official regulatory board for the English language and if there were I should hope it wouldn't be Oxford. It's more that the Oxford comma is the hill I so often see hardcore-prescriptivist Anglophone would-be grammar snobs choose to die on, or, the sort of person who thinks Eats, Shoots, and Leaves is the height of wit and to whom it has never occurred that it is troubling that all of their favorite books were written by white Brits and contain no poor people. It's got a certain schadenfreude glister to see the great guns of linguistic prescriptivism turned on the people who usually love it so much.

So, I'm sure Chicago will still avail you. I'm not a fan of the Oxford style overall for personal use, but it's pretty contextual to the Queen's English in a lot of cases so I never expected to be.