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sys.executable could be used; it points to the installed
python.exe. This would make the .bat files work.

In a standard Python installation on Windows, the PATH is
not set to contain the directory containing it; it doesn't
need to, since the interpreter will be called when the name
of a Python file is entered. It would be more useful to put
the ...\Python\Scripts directory in the path, I think.

If '.py' is contained in the PATHEXT environment variable,
even the extension .py can be omitted.

I don't think the newlines are an issue; all editors I use
work perfectly well with *IX or DOS files (at least when the
linebreaks are consistent).