std::wofstream gets broken in binary mode in GCC but works in MSVC

Question

The following piece of code produces a file with a single byte when compiled in MSVC, but when compiled by GCC 8.3 it produces an empty file.

std::wofstream out("tmpUTF16BrokenBOMFile.txt", std::ios_base::binary);
const wchar_t c = 0xFE;
// Both methods dont work:
// out.write(&c, 1);
out << c;
out.flush();
out.close();
std::cout << strerror(errno) << std::endl; // results with "Invalid or incomplete multibyte or wide character" on GCC

Is there any reliable way to output wchar_t into a binary stream without worrying about codecvt that can suddenly kick in and break everything? I mean I am using binary mode exactly because I don't need codecvt here.

I know that its better to use ofstream for binary output, but unfortunately usage of wofstream is part of API that I cannot change (Although I see that it is an incredibly stupid idea, at least because wchar_t size is not defined by the standard).

Update: looks like the following custom codecvt helps if I imbue it into the stream, but I am not sure if this is the right way:

class noconvCodecvt : public std::codecvt<wchar_t, char, mbstate_t>
{
public:
    virtual bool do_always_noconv() const throw() override
    {
        return true;
    }
};