Possibly he raced under the pseudonyme "Monsieur Adrian" and in a Bugatti 35.
He could also have used the name "Inge Vidare" which is a joke, it could be quite normal names in Sweden but together it means "No Good"

He lived most of his time back then in southern France, so IF he was a racing driver, most likely he raced at places like Pau, St Gaudens, Angouleme etc.
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Hans? Leif? Or any other expert on that era? What's your opinion, did he exist as a "famous driver"?
Stefan