Apparently a bloke called Lex DuPont did in the USA. This was raced from1952-1963. The engine was an alloy pre unit Tiger 100 with a facrory speed kit fitted. Details of this are in Lindsay Brooke's book " Triumph Racing Motorcycles in America". I think Lex DuPont was of the family that owned Indian at one stage. The DuPont paint people.
Stirling Moss's career started in formular three, with Manx Norton powered Coopers. Harold Daniell drove Kiefts. I think some of the great tuners like Lancefield and Beart prepared engines for this discipline of motor sport. Coopets also used JAP engines.