mingw-w64 with seh exceptions, win32 threads

Perhaps this question should go to Debian - I'm interested in using the MinGW-w64 cross-compiler package but my preference is for SEH exception handling on x86_64 (rather than sjlj), and win32 threading instead of posix to avoid the dependence on libwinpthread-1.dll. Other non-Debian distributions like Fedora and OpenSUSE provide this combination by default, though I recognize win32 threading does not work as well with std::thread so it's not ideal for all users. If there were a mechanism for providing multiple options through Debian/Ubuntu packaging, it would be a much more versatile platform for cross-compilation.

Maybe this would be good to do as a PPA? I'm experimenting now with doing dpkg-buildpackage with a couple small modifications to the debian/rules file where the appropriate configure flags are used.