Funnily enough I've been looking at doing the same thing, I want to use a 1" quill stem on a Kona frame, I've looked into the Chris King devolution idea, spoke to Bromley Bikes, but this only works with the A-Head system as Chris King do not do the gripnut to fit it, do you think you could just use a 1" grip nut....????
Their suggestion was to run a shim in the head tube, does anyone know if this would work or where to get one made.