Throwing my hat in the ring for dev-mode (you’ll need a free developer account), which doesn’t interfere / get removed with updates and has a gracious timeout of 999 hours these days, at least on the newer models, but likely in general. I’m using Kodi and the ad-free Youtube + sponsorblock client uploaded via dev-mode-manager, which accesses the WebOS homebrew project that also offers some other useful apps (e.g. a Moonlight client).

Can only speak for newer models, but LG has changed the devmode timeout to 999 hours, which is plenty of time to hit the refresh button in the meantime. It can be automated as well.

Since you mentioned it: Debrid has been serving this old pirate (used pretty much everything from IRC dl bots and the original Napster) well. Torrenting is much too dangerous … and has been for a long time where I live. Maintaining a large library feels a bit like “been there, done that” and is cumbersome (even if well automated) with what little I’m watching these days. Streaming cached torrents from the debrid service of your choice via Kodi and the relevant addons is as painless (everything up to 4K works flawlessly, usually many sources available) as it gets while still having most content ready at my fingertips.

Solved: It was an oversight on my part: I didn’t include the “.well-known” part in the backend block. When changed as follows (compare above), it works as expected -

    ## Backend                                                                                                                                                                                                  
    location ~ ^/(api|pictrs|feeds|nodeinfo|.well-known) {                                                                                                                                                                  
      proxy_pass http://127.0.0.1:8536;                                                                                                                                                                         
      proxy_http_version 1.1;                                                                                                                                                                                   
      proxy_set_header Upgrade $http_upgrade;                                                                                                                                                                   
      proxy_set_header Connection "upgrade";