I don't think there's a way to link another NNID. I guess my NNID has become a ghost basically. Whenever I sign into my existing apparently it doesn't exist but I can still access online and see my Friends List.
@K3Nv2 I got some cheapies at wallys, that are pretty good, already have lost a few expensive ones (one falls out and gone, can't find) while cutting grass so bought some cheap ones, and of course never lose these cheap ones. (Cheap meaning only $35, compared to air buds which I only have 1 of 2 now)