You mean using a splitter on the light side, one going to SP one to SON?
Or do you mean ending the light wire in SON spades and then having a 5cm wire with Spade---->SP clip that can be added into the mix when using an SP hub? I guess the latter is neater.
Is there any sort of clip/adapter to be able to use SP dyanmo clips with SON dynamo metal tabs?
ie. http://www.bicycles.net.au/forums/viewtopic.php?t=98734