git-p4: Import not at root of tree.

I'm trying to mirror a directory deep down in a very chaotically organized Perforce repo. I'd like the git tree to contains the contents of this directory, but not at the root of my tree.

In other words I'd like to have something like

   git-p4 clone --strip=//depot/a/b/c --destination=foo //depot/a/b/c/d

Result in:
   foo/d/...

and have only a single directory 'd' at the top of the resulting git repo. My current choices seem to be to put the contents of 'd' at the root, or have the whole 'a/b/c/d' tree visible as what the '--keep-path' option does.

If this isn't implemented, any suggestions on the best way to go about implementing this, or another way to do this.

What I'm trying to do is emulate the behavior of a P4 client spec. There is a single directory (now, there will probably be others later) that is in a different place in Perforce and it needs to be in this directory in order to build. I've tried working with a submodule, but it is cumbersome to do things like bisections when there are dependencies between the trees.

Thanks, Dave