If you can't install an SSH server on your Windows server running DFM, the other option is to write your WFA commands in Perl and use the NMSDK Perl modules for taking actions in DFM. I'm 99% sure there's at least one example command of using Perl to interact with DFM built-in with WFA 2.0.
Refer to the WFA install & config guide for integrating Perl and the NMSDK with WFA.
I'd be curious which route you choose.
Thanks,
Dave