Joined: Nov 2006
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From: NJ, NYC, LI
Bikes: 1940s Fothergill, 1959 Allegro Special, 1963? Claud Butler Olympic Sprint, Lambert 'Clubman', 1974 Fuji "the Ace", 1976 Holdsworth 650b conversion rando bike, 1983 Trek 720 tourer, 1984 Counterpoint Opus II, 1993 Basso Gap, 2010 Downtube 8h, and...
Velo Orange and Electra also have chain rings that fit, though probably not the size you want. If you want an outer ring chain guard, and are willing to consider the blasphemous option, you could just file the teeth off your existing outer ring. Change your middle ring to a 44T; I don't think there would be any advantage to changing the inner ring.