Are the plugins VST by chance? If so, check out yabridge, you can install the plugins with wine and even supports 32-bit plugins

That's fair, never used Plex but I suppose it's more polished being a product and all. In my case, I read Plex requires an internet connection to work and I needed my media server to be available offline, so it was a deal-breaker

My 5¢, got a similar stack running fine on a Pi 4B 8GB (with Jellyfin instead of Plex). Just gotta make sure to direct play, it does not like transcoding too much, even with hw acceleration

Incredible news. I will absolutely be launching the rocket again