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Spider tabs are 5.5mm and the rings are 3.1mm, so moving to the outside would get the chainline to 51.3mm based on the nominal original chainline of 42.7mm. That's actually further out of line with 46mm than the inner position.
A flat adapter ring would allow you to fit a ring at very close to 46mm, since the spider tab inside face is at 44.3mm and you'd add half the chainring thickness by bolting a ring to the outside face of the adapter (or the other way round, outer face at 48.2mm minus half the ring thickness). See Cliff Voller's bike here for an example
gbj_tester-
Thanks, but that sounds expensive for what is intended to be a cost effective Winter/wet weather choice.
Planning to use a Velosolo converted disc hub, which are either 41mm or 46mm and it would have been nice to be able to use it on my other 46mm bikes.
They do sell 2mm sprocket spacers, so I'll either go with 43mm (and Alfine) or 46mm and Ultra Torque.
Scilly.Suffolk
Is it possible to get a 46mm chainline with Shimano Alfine cranks?
Perhaps by mounting the ring in place of the guard?