Hey all, just thought I'd share a cool find:
I found a patch for Rockbox, it enables line out on the Sansa Fuze v2 through a simple setting that you can put on your homescreen to switch between line out and headphone. It was literally posted just today, but I compiled Rockbox with the patch applied and sure enough, it works perfectly!
I'm not about to post a version of Rockbox that I self-compiled, but here's a link to the patch on the Rockbox patch tracker.
If you need help figuring out how to compile Rockbox and apply patches, look around the Docs Index on the Rockbox site, and I think there might even be a YouTube video or two to help you get started.