oxTrust was designed to be a tool for admins--not really a delegated administration tool. There are some basic user features, but to be honest, we don't really encourage usage of oxTrust as a user facing application.
To accomplish what you're asking, you'd have to do some pretty heavy java programming, implement new dynamic rules in Jboss Seam, and then implement those rules in the UI. Not a recommended activity... and certainly not something that we can support on the forums.
A better path might be to write a standalone application that calls the SCIM API's or even the LDAP API's with just the data that you want to expose. And make that new application an openid connect relying party (so authn can be handled by the Gluu Server).
Good luck! Sorry oxTrust is not what you're looking for!
- Mike