Thanks for the response bertrandleroy, I dug through a lot of code trying to find an example but never thought to look at the attributes. That is a much easier solution that I was expecting.
To leave a road map for others with the same question, add
... and ...
before the controller definition.
is what generates the view of the contentType (now with the theme) and can be returned as the View from the action of the controller. If you search for it in the code, you'll find examples of how to use it.