MusicBee won't mess with any of your files unless you change settings or make direct changes. I suggest you give it a try and see what happens. I wouldn't even worry about using the iTunes library unless there's data there you care about it. If it's only the playlist, make sure itunes is storing then as m3u files and you can scan them into MusicBee as-is.
However, I suggest you test with just one or two, maybe exported copies, until you're comfortable with it. MusicBee will re-save playlists in it's own format (mbp) unless you change the library settings, but you can export them again as m3u any time. Or even have it automatically keep an m3u copy for you.