Instead of blowing this up here I would go for using cookie-cutter-zope-instance which supports all available options already. It comes with a helper transform-from-environment.py to turn environment variables into settings.

@jensens I like that idea, but we also need to be careful we don't break things if cookiecutter-zope-instance uses different environment variable names from the ones that have been here for some time. Maybe someone can investigate at the Alpine City sprint?

Also note I already merged the same change to the 6.0.x branch

It uses different names, indeed. We could add a compat layer and deprecate the old names for a while. +1 for more at ACS