combine two FAC audiences in AJO to read attributes

In FAC if there are two audiences, and AJO requires reading attributes from each FAC audience . Currently AJO has limitation of reading one audience per journey. Thinking of creating master audience in FAC which combines both FAC audiences into single. Are there any better approaches to handle this in FAC level or AJO level ? Does AJO provide ability to combine multiple FAC audiences into to single audience in order to read their attributes