I don't know if you're trying to be an asshole, or if I'm just adding a sarcastic tone to "clairvoyently" (sic) when I read it in my head.
I didn't "clairvoyently" (sic) anything, OP clearly indicated he was using a new3DS as his primary and that it had his NNID on it.
So the source is his primary which he then system transfers to the hacked new3DS he will purchase, then he transfers back to his primary thereby retaining all data, saves and his NNID.
This is all fine and dandy if you're a pirate who never has, and never will, give Nintendo any money beyond the initial outlay for a suitable DSiware game.
I know it's a little difficult to wrap your head around, but we don't all hack for the sole purpose of piracy.