The issue with the Mac that KopyMac solves isn’t the id3 tag problem; it’s the additional files the Finder puts on the player if you use the Finder to copy files to the player. KopyMac doesn’t know anything about id3 tags.
Id3 tag problems sometimes exist, as that problem is independent of whether you are running on Windows or a Mac. You won’t have id3 tag problems with Overdrive books. My guess is that you could correct any tag problem with iTunes, but I haven’t tried it.
KopyMac is a downloadable program. What it does is move the mp3 files to the player without creating the ._* files that the Finder would create if it copied the files.
I’ve never used Overdrive on the Mac. There are two major restrictions noted in the OverDrive Media Console documentation, including that OverDrive Media Console works only with Apple players (i.e., iPods). Click here for their instructions for using OverDrive on the Mac.
If the stated restriction that OverDrive Media Console can be used only to transfer files to Apple devices is accurate, then I would not expect the program to work with the Fuze.
Also, the Overdrive documentation says “Note that OverDrive Media Console for Mac supports OverDrive MP3 Audiobooks only.” Only some, generally older, books are in mp3 format. Most are in WMA format as that format allows Overdrive to enforce an expiration date (mp3 format files do not expire). I think that’s a big limitation on usability of OverDrive with the Mac.
It would be most helpful to hear from a Mac users who has tried the OverDrive Media Console.