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As far as I know neither SON nor SP do 15mm to 12mm end caps for conversion only a QR converter. There is a Taiwanese company making a dynamo hub that looks identical to the SP that can be converted but I forget the name, check the cycling about.com article about dynamo hubs. Also why not just go for a 12mm axle carbon fork?
Edit: The dynamo hub is made by K-T although there doesn’t seem to be many reviews out there yet.
SoYaap-
I have a KT dyno hub, got 2 years of good miles on it, all good so far. SP I had before the KT was getting loose by this stage (cursed it now haven't I..).
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15 -> 12mm is just a sleeve that goes into the hub you can get from all over the place (think mine was off ebay). The SP TA->QR converter is a little bit funkier with machined high and low bits presumably for where the bearings are at.
jameso
hippy
That sounds doable. Would they need to be specific to the hub? I’m thinking SON or SP dynamo. Can’t see 15 to 12 end caps made by them.
To clarify, I think I may need to switch between carbon and steel forks for touring, so would like one hub to fit 15mm carbon and 12mm steel forks.