If you wanted to just redo your library you could go to videos>files> context menu over a source, select “change content”, set type to none, click OK, and then say yes when it asks if you want to remove the items from your library. You would then context menu over the source, choose “edit source”, change the file path to point to your system mount, then click OK. You would then context menu over the source again, select “set content”, and then setup your scraper setting again. Repeat for each source you want to switch over.
Personally I think path subs are easier and you won’t lose your watched status, which IMO makes it better, but either way works fine.