Applying builder theme and layout to a plugin module

We're in the process of developing a few custom plugins for use in our Confluence installation, which uses ThemeBuilder v3.

One plugin is a custom XWork module that implements a user contact information form (more or less following the tutorial found in the Atlassian Developer Hub). The results for the XWork actions are Velocity templates which provide the form markup.

My question is this - how do I apply the ThemeBuilder theme and select a layout for templates that fall outside of a Space? I assume there is a way to do this with some combination of the applyDecorator / decoratorParam Velocity tags?

EDIT: ~gfraser Moved topic to Builder Forum