svn switch when rebasing repository?

I've changed our repository to use paths such as svn://hostname/
projectname/trunk instead of svn://hostname/trunk etc using dump and
load with --parent-dir.

However changing working copy repositories for developers has been a
bit more difficult. I've tried svn switch, but i get errors like

Macintosh:src2 torgeir$ svn switch svn://hostname/project
svn: Failed to add directory 'trunk': object of the same name already
exists

I',m trying this from within the src2 directory, which contains the
trunk and branches subdirectories, some of which has local changes.

svn switch --relocate seems to be only for changing the actual hostname?

Any ideas? Should I rather go for a diff / patch approach, or write a
sed script that changes urls in each .svn/entries file?

-- 
Torgeir Veimo
torgeir_at_pobox.com
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