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Yeah but the dynamo in the end is some wire cabling around a spinning magnet. Magnet attached to normal spindle and wire as a casing (as you see plastic casing for vintage BBs)
In the end normal wheel dynamos are smallish. Could be done and also with a tiny bit of battery to hide inside the tubes that depart from the BB shell...need to patent this :)
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.
frankenbike
What I mean is the front one works any time you're rolling whilst BB dynamo works only when you're pedaling. With no stand light/capacitors/batteries/etc. and only a BB dynamo you'd have no lights if you coasted down a hill for example. Also it'd have to be quite robust to withstand full torque and the cabling would be complicated with two dynamos. Just some first order considerations, it could work though