I have all of that, except instead of Kodi, Jellyfin. Also no nzbget because I just found out about that and AFAIK you need some kind of invite to enter a Usenet? I dunno! I get by with torrents :)
The good thing of Usenet, apart from the speed, is that you are downloading only, not sharing, and in some jurisdictions that matters.
Anyway, most free Usenet providers place limits on how much and what you can download. I use Eweka, which is a paid provider. But there are a lot more. Eweka is a normal Usenet provider (I use it to access normal Usenet too) but it gives access to the entire Usenet, and it's fast.
Then nowadays all the pirated content in Usenet is scrambled, so you'll need an indexer, which is a search engine for content on Usenet. I'm not sure if I can share which one I use here, but you can check the Usenet subreddit, if you want to use one.
All in all, the setup works well. I give preference to Usenet content, because it's fast. If the *arr apps can't find the content in Usenet (because it's too old, for example), they switch to torrent.