Another developer sent me an update extending the number of CB custom fields that could be used to determine the JUGA groups that a member could be placed in. He also added radio buttons or a dropdown list option.

This module requires Community Builder and JUGA to operate. Operation is simple: Create a new Checkbox field in Community Builder. Include the field in your registration form. Publish and configure this module. When your new registered user visits the page where the module is published, the module automatically assigns them to the JUGA group based on the parameters you select in the module. The module can display information to the user, or not (configurable within the module). The module does not need to be on every page, and does nothing if the user is already in a group.