While I haven't done exactly what you are requesting, the help file has this to say about the matter:
<snip> [from Make VS.Net section]
Override default DEVENV location: Normally, the custom action looks for the command-line DEVENV compiler by first looking for this registry entry: HKEY_LOCAL_MACHINE\Software\Microsoft\VisualStudio \<ver>\InstallDir (where ver = 7.0 for Visual Studio .NET 2002 projects/solutions and 7.1 for Visual Studio .NET 2003 projects/solutions) and appending devenv.com. If that entry is not found, the value of the entry HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\Curr entVersion\App Paths\devenv.exe\ will be used if found. By providing a full path and filename for this field, the action will use that as the command-line executable rather than the default.
</snip>
So I would recommend either hard-coding a path (probably won't work in your situation), or assign your macro to this field, and change the macro value to the appropriate value before you invoke this step (maybe a subroutine?) in your build.
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