How can one get a 32 bit compiler environment with 64bit Matlab, Simulink Coder and the Microsoft Windows SDK 7.1?

In my target I'm trying to build a 32-bit Win DLL from a SL Model on a 64-bit Matlab using Simulink Coder and the Microsoft Windows SDK 7.1. In earlier Matlab versions I created a wrap_make_cmd_hook.m function for my target and changed the 'AMD64' flag to the 'x86' flag. This works fine for MS Visual C++ Express (2005, 2008 and 2010) compilers.

Does anyone have a solution for the MS Windows SDK 7.1 compiler? Since this is the only one free available compiler supported in R2012b/R2013a.

Thanks.