Automatic iTunes Playlist Re-Scan/Update

I realize that the external music playlist import in Plex using the iTunes music library was meant to be a on-time import tool (that’s what I read). However I (and I’m assuming many other users) am not managing my music playlists in Plex. I am using other apps to do that. Since I am constantly updating/creating new playlists, I would really appreciate a feature that either automatically scans my music library for playlist updates or that allows me to manually add playlists on file or folder basis. Currently, the only way for me to do that is to delete all my music playlists and re-scan my entire music library, which takes a loooong time, as I have hundreds of m3u playlist. If I just re-import without deleting, then I get duplicate playlists (even if I select overwrite). Any help in making this possible would be greatly appreciated!