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@lae
I've been riding round the Kingpin stock for the last couple of days - it's pretty good; a fair bit quicker than the Raleigh Twenty.
I've measured the original cranks which are exactly 7" or 177mm (I suppose this gives more sensible gearing since old 3-speeds always seem to be geared too high). I've also discovered that it uses 500A wheels, not 20 x 1 3/8 - 440mm rather than 451mm. So with the cranks being bigger than I thought, and the wheels being smaller, it means that fitting BMX wheels (assuming slightly taller tyres) and 165mm cranks will actually result in slightly more crank clearance, not less. So no worries about clipping pedals whilst cornering.