Help using Git(-svn) for specific use case

Hi all.

I'd like to start using Git within our company. I'm still trying to
determine if Git can work in our scenario.
May be someone can offer some advice.
Our scenario is as follows:
We have a handful of developers which work at a branch office. This
office has a rather slow internet connection.
At the head office, we are (still) using a Subversion server to host
our source code.
At the branch office, we would like to do the following:
* Fetch the latest code from the subversion server.
* Push changes that we have made at the remote office back to upstream
SVN server.
* Be able to share source code changes locally (at the branch office)
between developers.

The solution that I imagined is that we would setup a server (lets call it A) at the branch office with a Git repository, that all the developers can access. Developers would then clone the server repository A, make mods and then push changes back to A. It would be nice if git users could commit to a subversion branch. A merge master would then (as necessary) use svn dcommit to push the changes up to the svn server. Is this scenario possible?

the refs/remotes/ hierarchy or any git-svn metadata, or config. So repositories created and managed with using git-svn should use rsync for cloning, if cloning is to be done at all." Does that mean that one should not push changes to a repository that was created with "git svn clone ..."?

Thanks in advance for any advice.

Pico Geyer