rutracker.org (note this is different from the other rutracker so make sure it’s .org) is a Russian tracker with a lot. From what I’ve seen, most of their flac is from Quboz but I mostly go for popular stuff so idk about about more niche music.
Honestly, even though it’s a pain, it might be worth it to just bite the bullet and try for the Redacted interview. I’ve been thinking of this for myself.
Trackers for audio content
What public indexers do people advise for audio?...