The last I looked into it, the best way to do it was to get an older kindle so you could download the older DRM copies of books from amazon. But I think some newer books are using only the newer DRM which I don’t think has been cracked.
It has probably been at least a year since I checked. If you do end up finding an updated method, I would be interested.
BitTorrent v2 allows this also. In v1, torrents with multiple files are hashed continuously (cat) together without respect to file boundaries. A side effect of this that many people notice is that to grab a specific file may require downloading some of the files before or after the one you want.
Under v2, each file is hashed separately, so this fixes the aforementioned problem and should allow sharing of files across torrent files.
If you don’t want to risk getting a ban at all, the only safe thing is to not connect to the internet at all. Maybe there is some level of safety, but it could take only one mistake.
If we assume that we fully understand how nintendo catches this, we would still only ubderstand at that point in time. They could still change or push updates which could cause you a problem.