How do I copy Playlists to my iPod nano 3G without duplicating the songs?

I've created a few playlists in iTunes. These are "best of" Playlists - for example 6 tracks that I really like from an album of 10 tracks.

Now the entire album, in each case, is already on the iPod. When I drag the Playlist to the iPod though, it copies the 6 tracks to the iPod, even though the tracks are already on the iPod. This causes needless capacity-wasting duplication. What I want is to copy the information in the Playlist, *not the songs themselves*, so that on the iPod I can select the Playlist & listen to it, with the iPod playing the 6 tracks out of the 10 that are already stored, not playing 6 duplicate tracks that don't need to be there in the first place. Is there any way to achieve this?

This is a similar problem to the one I encountered with album artwork (see my earlier topic here: http://discussions.apple.com/message.jspa?messageID=7921664) - needless capacity-wasting duplication - which isn't entirely solvable due to bad design of the iPod software. I suspect the Playlist problem might be similar unfortunately.

Any advice would be appreciated.

Thanks.