Bumping this thread again. Hopefully someone at Evernote is taking note that it's a pretty bad experience editing a template (which isn't possible since creating a new template is not the same thing) when you simply need to fix one misspelled word.
I would like to be able to edit the original note I based the template on and then have some sort of "refresh template" option. The reason being is that I share my "template" by sharing that original note. If I need to fix something, I want to be sure it's reflected in the version the other people I have shared it with are looking at.