SVN – How to Change Subversion Working Copy UUID

I've recently updated Subversion repositories from an old 1.2.3 version to 1.6.0 via svnadmin dump/load. The old repositories all used the same UUID (repositories were created using by copying a template repository). I've changed the UUID on a couple of the new repositories via svnadmin setuuid to be unique. I can't just relocate my existing working copies of those repositories because the UUIDs are different. I know about exporting the working copy and checking out from the new repository, but I was wondering whether there was a way to just change the UUID of the working copy in-place, like what svnadmin setuuid does for repositories.