If all you are doing to the objects in question is toggling the value of that one field, I would suggest that there's no need to have an UpdateView. You can just add a simple POST form within your DetailView, including a toggle button, whose 'action' is a URL that toggles the 'editable' field.
In the DetailView definition, add a post() method, to handle the form submissions and actually change the value of the 'editable' field.
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