There's a way that you can get a new switch for sure, but due to ethical matters I won't tell you how.. but it's easy, just think harder (that's the only tip I can give you.)
You're talking about Mariko like it's already in stores, it's going to see the light of day in 2019 at the earliest. Also their marketing is not "all switches" but "all switch firmwares".
what you dont know, is, that nintendo will track this based on your NN id, so even if you do return it to the down unda, the second you relink it, the ban hammer will drop.
Are we certain the bans are linked to Nintendo ID? If so you still get a new switch and just have to create a new ID I guess.