http reverse proxy to different path possible?

I found some examples of using apache's ProxyPass to reverse proxy
subversion requests to a different server, but all of them had the same
local/remote path. Is is possible to:
ProxyPass /path/ http://other_server/some/other/path?

No matter what I put in ProxyPassReverse, the /some/other/path seems to
leak back to the client. It looks like it should work when just using a
browser to traverse the repository or doing an "svn ls URL" , but
Tortoise doesn't like it and attempting to check something out gives:
"svn: Unusable URI: it does not refer to this repository".

I'm trying to make something that has many embedded external references
to a repository at an unreachable remote location work against a copy
that has been svnsync'd to a different place. Is there a better approach?

-- 
   Les Mikesell
    lesmikesell_at_gmail.com