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Kometa
Python script to update metadata information for items in plex as well as automatically build collections and playlists. The Wiki Documentation is linked below.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
You then want to make a single movie library that uses the /Movies path. That way when movies are "upgraded" you don't have to have that new library download new metadata. Plex natively doesn't have auto collection creation but you can use something like Plex Meta Manager. I'd try to figure it out using their wiki but if you can't or need help they seem to have a discord. Just quickly looking you can make collections by resolution so I assume there is some way to base it on audio type.