external in reverse

[I'm re-posting this via web, as I posted it via e-mail on Friday and apparently fell into a black hole...]

I have the following interesting situation:

I work on some projects whose versioned files must be, as workcopies, in completely different paths inside our Windows boxes. Something like this:

C:\Projects\My\Gizmo and subdirectories -> many versioned files
C:\Tornado\target and subdirectories -> a few versioned files

Conceptually, the second tree should be a sub-tree of the first one: when I tag a version, it should refer to a precise photograph of both trees, when I branch, it should branch both trees, etc. But Windows does not have real links, and I haven't
found a satisfactory solution yet (well, actually I'm playing with something called linkd.exe, but there are some quirks.)

I would be happy with a kind of "external in reverse": when I pull C:\Projects\My\Gizmo from a repo, it should also pull C:\Tornado\target from the same repo. And an "amplified external in reverse" would be perfect: pushing C:\Projects\My\Gizmo should also push C:\Tornado\target.

How would you work around this situation?
Would you migrate to Linux :-)?
Would you use some new reincarnation of olde MS-DOS join / subst?
Would you implement some kind of clever hooks and/or local batch files?
Would you modify the svn files to implement the external in reverse?
Would you maintain two separate repositories and perform some clever tricks to "sync" them?

--
Saludos
Ignacio G.T.
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