Once I worked around the example.bat problems so repository _tkinter will run for one python version (3.2), Zach's patch seems to solve the test problem as well as mine, and it is better self-contained. In other words,
python -m test -ugui test___all__ test_tcl test_tk test_ttk_guionly test_ttk_textonly
runs all five tests with os.environ change the only problem noted.

If Ezio or someone else who knows testing better than me agrees that it is the right patch, I am willing to apply it.