My favorite podcast is Blank Check, a podcast about auteur directors who have initial huge success and how they use that success to make the films they want to make. I've posted to
their reddit.
One of my other favorites is one of the longest-running podcasts around, The Flophouse. Basically the original "bad movie" podcast.
Their Facebook group is basically the single bright light in that god-forsaken platform, as far as I'm concerned. I apologize but apparently it's not public so I can't share the post, but I fully cross-posted it to their community as well. They're the ones that I've had great success in ID'ing things with.
I hope we get an answer! These are the biggest movie nerd circles that I run with, so if they don't know the answer, then I'm probably of no further help!
But there's a possibility that the expert community you'll end up needing is not in the movie world. You might be in more need of a musicologist or something...