Today has been "a day" (noisy construction work outside all day), so I took a ten minute break from work this afternoon and did some internet searching, and turned up the correct incantations to have youtube-dl download things and save them to disk in a plex-friendly naming scheme.
Part of the incantations were some plex plugins to do what I can only assume is magic with the metadata and "suchlike".
This new skill, of course, comes with the added bonus of having to keep an eye on the available space on my NAS, because that is going to vanish, quicksharp, I reckon.
A bunch of technomancers in the fediverse. Keep it fairly clean please. This arcology is for all who wash up upon it's digital shore.