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I didn't realise that this topic had been revived! Good to see other people have taken the ball and are running with it.
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I bodged the stock Brompton shifter - see the PDF
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OP here. I'm still running the conversion and it's still fine.
I would update the PDF, but I can't find the original document
The major change that I've made since the original is to replace the hacky garden wire circlip with the original Brompton one - you need to file back the inner face of the smallest cog to get it to fit, but I did have problems with the wire coming out and leaving rattling cogs. I wish I could just find a thin-enough circlip of the right diameter - if you do, please let me know.
The shifting is a little temperamental. When the cables get sticky or the jockey wheels clogged I need to throw the shifter from 1st to 3rd rather than trying to go from 2nd, but the convenience of 3 close ratios for my flat commute outweigh the negatives for me.
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There is a middle way on the tyres.
I run a Marathon on the back, where I get most punctures and it's a pain and a 15mm spanner to fix, and a Kojak on the front, which I rarely flat, has no chain to manage and can change with an Allen key.
I keep a spare tube in the frame, but with this arrangement haven't had to use it all winter. And while the bike feels sluggish with 2 Marathons, I can't really feel the difference between this arrangement and a pair of Kojaks, which averaged a puncture a fortnight over the summer.
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BTW, my height stop on the seat post is lightweight insulating tape :o) I just read the instructions for that really expensive thing on the tat bazaar and improvised - works a treat.
Try this http://bromptontalk.wikispaces.com/Seatpost+Height+Keeper
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just doing this to my 2 speed
Let me know how you get on - make sure you read the addendum at http://bromptontalk.wikispaces.com/3+Speed+Cassette
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That kit has the new QR included, or you can get it on its own
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I've tried using a standard seatpost QR, but frankly, you're better spending the money for the pukka Brompton part. It stays in line instead of hanging down, and the cam action is just right, whereas a standard QR goes from too tight to too loose without ever being perfect.
I haven't tried it, but this https://bikegang.ecwid.com/?3vOM2tpoyAUSFIWU-Te2WMunXOCIAUaWhSyxRHLzwBUfmyTqrZ6dOUI9E#!/Brompton-2-to-3-Speed-Sprocket-Cog-Thumb-Shifter-Kit-MiniMODs-x-Sturmey-Archer/p/115439619/category=9803294 looks like a cheap and simple way to try this mod