Hi,
In our experience, it is possible with some trial-and-error. We ended up hijacking the configuration command lines for binutils/gcc/gdb, manually patching them to produce a Windows toolchain, manually running them and resolving the issues that arose. If you wish, we can do it for your custom module for a fixed price. We would need your existing VM with the regular toolchain build environment; we will edit it to produce a Win32 toolchain, and will document the steps needed to fix everything. Feel free to reach out to our sales if you would like to get a quote.