Streaming is a continuous service. If you want that, you may actually want to consider one of the commercial options.
You could download the music and self-host a Navidrome server or something similar.
You could even do it like me and have Navidrome server in your pocket. It's natively available in Termux, so I can stream music from my phone on LAN.
But that depends on your library size.
Also... many memory cards seem to have terrible random access speed (and sadly that's something you can't know before buying it), so the initial scan may take a few minutes.
The others are right. Trying to stream from a torrent seems wasteful and complex.
But if you must for some strange reason, perhaps it would work to use webtor.io to produce an http-reachable audio file which could be curl/wget-fetched and piped to an audio decoder/player. I doubt you could make webtor fetch pieces linearly from the beginning. You would likely have to wait until the last piece is fetched to start streaming.
sends it to RD to get the cached version of the video
RD sends back the URL
Streamio plays the URL like many video players can do
This is easy for movies/shows since there's only one video to be assigned for a movie or tv season, even if they have inconsistent file namings, it's still easier to assign them. Dune.2024.mkv is similar to Dune-4K-2024-Xrip.mkv. Same goes for the-boys-s02-e03.mkv, etc
For audio, things are much more complicated. First there's the artist, than the album, which can either be sort of a single, EP, or full album, then there are the tracks, and then you have all the remixes, live versions, and what not.
Then, there's no reliable source like Trakt, where all this is tracked. There's MusicBrainz, but some things are still missing.
So it's almost impossible to have something like that. Just download it and use navidrome