Best way to copy project from one server to another, and then back

I have two subversion servers. One is an open source repository not
controlled by me, and the other is a closed source repository which is
controlled by me. Both the open source and the closed source build together
to make one set of software. The closed source is a firewalled server at my
place of employment. Currently we are in need to rename the project for a
launch announcement at an upcoming conference.

Becasue of the sensitive nature of the announcement, we cannot make the
changes to the open source (sourceforge) project because our hosting service
will not temporarily restrict anonymous access to the source code to just
commiter's.

To workaround this, we decided that we will pull the source code from the
sourceforge project, into our internal, closed source repository. We then
want to make the changes, and once the announcement of the naming etc. has
been done, we can merge back to our sourceforge project the naming changes
that were made.

I was thinking of doing it via svn copy from one project to the other, and
then taking the diff and copying back as we need.

Just looking for anyone who may have a better way to do it, as the amount of
files that are changing, could become large, not huge, but big enough to
cause me to want to do it in a more automated fashion.

Thanks for anay help!

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