You can use the @ApplicationScoped annotation on your CurationConfiguration class, and then inject it into each of your step pages. This will ensure that all the filled values are persisted across all the pages in your app, until a page reload occurs.
For more information, take a look at http://docs.jboss.org/errai/3.0.2.Final/errai/reference/html_single/#sid-20938792.
Wow, I totally forgot about that one. This works, thank you!