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Hmm the OP was asking about a SON hub initially though and SJS cycles specifically suggest on there website that the halo 15-12mm adapter sleeve for example won’t work with SON?
SoYaap-
Well they said SP and SON but it seems SON have their pressure breather thingie in the axle space so perhaps that's the issue:
https://www.huntbikewheels.com/products/hunt-superdura-dynamo-disc-road-bike-pack-cx-wheelset-120kg-rider-weight-1939g-24deep-25wide#dynamo_infoEDIT: "Dynamo wheels (whilst being able to adapt to QR with a sleeve) cannot be adapted between 12 and 15mm (unlike a normal hub) due to the hub caps needing to be fixed and cabled for the dynamo to operate, and 12mm forks will not accept a 15mm cap as they have a small ridge above the axle interface"
This is saying you can't take 12mm to 15mm with end caps, which makes sense. But I'm suggesting taking SP 15mm to 12mm with a sleeve inside the hub body. This should make no difference to the fork interface.
hippy
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.