I know, the problem is to do a system transfer. I have no intention of buying another device at the moment, and in the case of acquiring a new console, I want to avoid the hassle of having the NNID locked in the banned console
Well, I have in Eshop only a few games in the old Club Nintendo and 3 DLCs of Smash Bros and Fire Emblem Awakening. I do not mind losing them, I just want to unlink my NNID from the console while it's still not banned. The 3ds.guide method is safe?