I have the 2.1 leak v2 and I've been tinkering with the live wallpaper issue. It seemed like I came really close, so I thought I'd share my findings and maybe an actual dev like yourself could use it in your endeavor.
First, I downloaded and installed the "LiveWallpapersPicker.apk" from this site:
Next, I downloaded and installed the "LiveWallpapers.apk" from this site:
Finally, I installed Helix Launcher from the Market.
Everything seemed as if it was going to work. Long press on the home screen, choose wallpapers, then Live wallpapers, which brings me to the list of live wallpapers currently available. Then I hit a wall:
"The application Live Wallpaper Picker (process android.process.acore) has stopped unexpectedly. Please try again."
Well, hope this helps. If you have any other ideas you'd like me to try, I'm up for it (as long as I don't brick my Eris of course