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As far as I know, the dynamo works by (very basic) having a magnetic plate spinning inside a copper enclosing. This moves the electrons inside the copper which equals to energy.
My idea was to use a magnetic plate on or inside the BB spindle INSIDE the BB shell and a wire enclosing INSIDE the BB shell (along its inner walls) as a dynamo.
The transferring cable would then go up along the downtube. Or come out from the BB cups.
anidel
Swapping a BB is much more appealing than buying a new wheel as well :)
For a very basic version one could probably rig something up with a triple crankset using a bit of chain on the granny ring to drive the "dynamo". Not on a Brompton obviously, just some old £10 bike or whatever. Need a nice narrow (part of) hub so as not to interfere with your legs.