I have a large music library based on CDs and vinyl that I've personally bought over to my computer. iTunes is very bad at managing the music and I'm very happy with another library management software (MusicBee). However, when I want to sync music to my iPhone I seem to have to use iTunes to do so. This is terrible - it is time consuming and often results in my music not having the correct cover art or details. Is there any other way I can sync to my phone? 

(Tech notes: latest iOS, lated MacOS or Win10 (multi-computer household; music library stored on shared network disk)