Hi,
May I ask, what does this application do?
I specialise in - and have 20+ years of - C++ experience, working in world reknown R&D centres.
Cross compiling of Windows code is best done with MinGW, MSys2 etc.
As long as the code is compatible with Windows libraries supported by MSys2/MinGW, you can cross compile the code for Windows , as -is.
I will only know, once I take a look at the code and attempt to cross-compile it for Windows.
Cheers