How to have multiple working copy directories use the same repository?

All,
  My current business requirements make it
advantageous to have two concurrent working
directories (that have similar file structure; but not
exactly the same); I need to maintain two separate
builds that are always up to date.  Each working
directory would be associated with a particular
branch/line of branches (think of two different
hardware platforms that have considerable overlap).  A
complication to this is that I need to use git-svn as
the remainder of the team uses svn (I just changed
from cvs to svn last Jan so it is a hard sell to
management to change again).  I'm using git for the
merge capabilities.
  I've looked at the "git for CVS users" section in
the docs and this appears to create two repositories. 
Is there a way to have two working directories that
utilize the same repository?
  I'm betting that I'm just trying to push my workflow
style onto git instead of adapting to the git way of
doing things; but thought I would ask.

TIA,

Bill PS. I'm trying to avoid the push in the commit, push, merge, dcommit cycle.

       
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