If I can't make the executable, by default on installing, be 'python2', I'm adding quite a lot of pain to users (in particular, all those users with #!/usr/bin/env python2 in scripts).
Tell your stick-in-the-mud customers to just symlink it. I sincerely doubt you will be sued for telling your customers to symlink `dead-snake` to `python` if they're really stubborn about not changing their code one whit.
