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@RichardC
The conversion is proceeding OK so far, though I'm a little concerned about retaining the sprockets. You mentioned earlier (#12) that you'd had problems with the garden wire retention method. I've tried various things but that's the only one that works so far, but I'm naturally concerned about its longevity. Was it difficult to file away enough of the smallest sprocket to fit the Brompton circlip? And what tool did you use for this?
Another question: somewhere you mentioned that you'd had to fit a home-made washer on the outside to enable the shifter to move further out. I've been wondering whether it would be possible to file away partially at the wings of the chain pusher wing plate to extend the shifting range. Do you think that would work?