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MechaMorgan
Scilly.Suffolk
a) Yes NJS BB shell is British standard, so you could use 24mm cranks.
b) You can't tweak the chainline at the crank, so you'd need to choose the inner (~41mm) or outer (~46mm) chainring position and deal with that.
~1mm (the inner ring position) shouldn't give you any problems, especially with a bushless chain.
The outer ring position will need the wheel respaced and redished to suit.