If you want every faction can gain "lost eagle" traits you must edit "export_descr_character_traits.txt" in \data\ directory and remove excludeculture line from their trait's stat part(first part of file)(currently all non-roman faction are exclude for get these traits along with redeme traits) then it would be nolonger previlage for roman to disgraced anymore.
For text description of traits are in "export_vnv.txt" in \data\text\ directory. It not hard for you to do.
Sorry for so undescriptive reply as now I'm at my parent home without XGM or even RTW to check it for you but if you want to I would help you out in next 3 days.(I'm on holiday of the most disastrous festival, Songklarn!!!
) To do this is easy for me who work on Ethnic Traits project.