I could be wrong, but as far as I know, there is no other way. It's really better to wait for the next beta, it's not that far away.Is there a way to re-install Beta 2? Other than a clean install, I don't want to backup/restore again which takes 4+8 hours.
I want to get rid of wallpaper problem because my Lock Screen is the second battery drainer app in the list. God know when Beta 3 is due. Re-install might solve the problem.